Intermediation Capabilities of Information and Communication Technologies (ICTs) in Ghana’s Agricultural Extension System

Information and communication technologies (ICTs), specifically those that are digital and interactive, present opportunities for enhanced intermediation between actors in Ghana’s agricultural extension system. To understand these opportunities, this study investigates the capabilities of ICTs in support of seven forms of intermediation in the context of agricultural extension: disseminating (information), retrieving (information), harvesting (information), matching (actors to services), networking (among actors), coordinating (actors), and co-creating (among actors). The study identifies the types of ICTs currently functioning in Ghana’s agricultural system, and applies a Delphi-inspired research design to determine the consensus and dissensus of researchers, scientists, and practitioners about the potential of these ICTs to sup-


Introduction
Agricultural productivity growth in Ghana, necessary to bridge the gap between potential and actual production of food and cash crops, is partly hampered by the prevailing approach to agricultural extension service delivery (Abdulai et al., 2020;Bua et al., 2020;McNamara et al., 2014;MOFA, 2007;World Bank, 2017). This approach is typified by extension largely focused on knowledge and technology transfer to farmers, rather than taking on broader roles (e.g., knowledge brokering, facilitating access to credit, and supporting market linkages) and serving a broader stakeholder base (Agyekumhene et al., 2018;Munthali et al., 2018). The narrow focus of this extension approach is problematic because farmers have multi-faceted production needs, and "improving food production […] is not just a matter of individuals [farmers] receiving messages and adopting the right technologies [from scientists/researchers], but has much more to do with altering interdependencies and coordination between various actors" (Leeuwis, 2004, p. 18).
More specifically, the prevailing extension approach fails to adequately coordinate the set of organisations 2 that support value chain actors 3 in emergent problem-solving (e.g., with respect to climate change impacts), facilitating business linkages between these actors, and facilitating the integration of scientific and other knowledges to produce appropriate knowledge and technology for value chain actors (Abdu- Raheem & Worth, 2016;Asiedu-Darko & Bekoe, 2014;McNamara et al., 2014). These drawbacks in the national extension system hamper production (Msuya & Wambura, 2016;Zwane, 2020).
Since 1996, statements of national agricultural policy objectives in Ghana have consistently posited that reorganisation and improved coordination in the sector are key to agricultural development and climate change adaptation (DAES, 2011;Sigman, 2015;Sova et al., 2014;World Bank, 2017). Based on this policy direction, proposed structural changes in the Ghanaian extension service delivery system have included accommodating private extension organisations to meet the high demand for extension services, value chain-focused interventions, and innovation platforms (Adekunle & Fatunbi, 2014;Agyekumhene et al., 2018;McNamara et al., 2014;Van Paassen et al., 2013). Thus, the extension ideology has broadened, since the 1990s, to include calls not only for top-down, one-size-fits-all approaches (i.e., training and visitation) but also for participatory and bottom-up approaches (e.g., farmer field schools) (DAES, 2011;Davis, 2008). The most recent Ghanaian extension framework is an 2 Research institutions, educational institutions, non-governmental organisations, development organisations, other government institutions, credit providers, weather service providers, transporters, and private extension service providers. 3 Farmers, input suppliers, processors, exporters, traders, retailers, wholesalers, packaging manufacturers, and other manufacturers. integrated pluralistic extension system (Abdu-Raheem & Worth, 2016;Sigman, 2015). This approach envisages strengthened research-extension linkages, broader service delivery lines, and a larger number of service providers, with the intention of meeting the demand of farmers and other value chain actors for extension services.
Ghana's current extension ideology aligns with the agricultural innovation systems (AIS) perspective. With a view to fostering innovation in agriculture, the AIS perspective focuses on influencing relationships between multiple actors and on the conditions (e.g., policies) that affect the actors' (collective) operations (Klerkx & Leeuwis, 2008;Leeuwis, 2004;Swanson & Rajalahti, 2010). According to the AIS perspective, the focus on multiple actors' relationships is necessary because: (1) innovation occurs when interaction between diverse stakeholders is increased and open, resulting in improved knowledge exchange and access to appropriate knowledge and technology; and (2) innovation requires networking through which actors form partnerships that allow them to access business development opportunities and engage in collective action to respond to systemic challenges holistically (Koutsouris, 2012;Swanson & Rajalahti, 2010;World Bank, 2012).
Extension approaches based on the AIS perspective involve three broad intermediary roles: demand articulation, matching demand and supply, and innovation process management. Demand articulation involves the engagement of sector stakeholders in activities such as joint needs identification, participatory problem diagnosis and assessment, and making interdependencies explicit (Klerkx & Gildemacher, 2012). Matching demand and supply involves establishing sector contacts and developing mutually beneficial relationships-advice, credit, input, and market linkages (Howells, 2006). Lastly, innovation process management comprises the creation of discussion and negotiation space for actors to coordinate and jointly mitigate constraints, maintain relationships, and engage in knowledge-sharing and integration or co-production for continuous innovation (Leeuwis, 2010;Vitos et al., 2013).
Despite Ghana's national agricultural policy direction transitioning to an AIS-based extension approach, barriers still stand in the way of both public and private extension organisations on the path to facilitating this new direction. These factors include financial constraints (e.g., untimely and limited funding), human resource constraints (e.g., freezes in hiring staff, limited staff numbers), and skill set-related constraints (e.g., limited adaptation on the part of educational institutions to develop the facilitation capabilities of extension staff ) (MOFA, 2007;Obeng et al., 2019;Sova et al., 2014).
At the same time, Ghana is a key African player in the innovative use of digital information and communication technology (ICT) (GSMA, 2019). Digital ICTs are now central to most spheres of development (Sein et al., 2019;United Nations, 2020), as represented by the ICT for development (ICT4D) discipline, which is focused on "the application of any entity that processes or communicates digital data in order to deliver some part of the international development agenda in a developing country" (Heeks, 2017, p. 10). Among the key ICTs and ICT-enabled services harnessed for developmental purposes are interactive voice response (IVR), short message service (SMS), unstructured supplementary service data (USSD), social media (e.g., WhatsApp, Facebook), and document and data management systems (e.g., Open Data Kit). Such ICTs and ICT-enabled services present new opportunities for connectivity and information sharing to enhance communication-related service delivery (Bell, 2015;Gershon & Bell, 2013). Therefore, these technologies are being explored by scientists, researchers, and development practitioners to respond to the limitations of classical approaches to extension and interaction in Ghana's agricultural system Fielke et al., 2020;Gakuru et al., 2009;MEST, n.d.;Qiang et al., 2012).
Currently, there is limited literature assessing the capability of different types of ICTs to drive agricultural innovation processes (Fielke et al., 2020;Van Osch & Coursaris, 2013). One such rare study presents an assessment by European experts of the capability of social media and other web-based platforms to act as drivers of agricultural innovation (Hansen et al., 2014). The study finds that a number of the platforms (particularly social media) have high capacity to support the following specific social networking functions that support innovation: discussion (Facebook, NING, ERFALAND, and Yammer); networking (Facebook, LinkedIn, and NING); crowdsourcing (ResearchGate and Crowdsourcing); cooperation (Yammer, ResearchGate, and Wikipedia); and co-production (ResearchGate and Wikipedia). However, the aforementioned European-focused study (Hansen et al., 2014) assesses forms of media that are often not easily accessible in African agricultural contexts, where farmers are typically located in rural settings with limited access to the internet and to mobile devices that support internet services (Aker, 2011;Nyamekye, 2020). Thus, the opportunities for ICTs presented in the Hansen et al. (2014) study cannot be fully leveraged in many African agricultural systems.

The African Journal of Information and Communication (AJIC)
In this study we seek to address a research gap through the identification of opportunities for ICTs to support intermediation capabilities relevant to AIS-based extension service delivery, in an African setting-specifically Ghana. The study identifies opportunities through a consensus-building exercise that captures the perspectives of scientists and researchers in the fields of communication, innovation, and development informatics; and practitioners of ICT for agriculture (ICT4Ag).

Conceptual context and analytical framework
In this section we start by discussing bridging mechanisms as an overarching concept that incorporates the core concept of this study, which is intermediation capabilities. We highlight the possibility of ICTs functioning as bridging mechanisms and, in doing so, supporting extension organisations in facilitating AIS-based extension service delivery. We also outline the types of intermediation relevant to this facilitation process, and the intermediation capabilities that the ICTs may support. We conclude the section by stating the research questions.

ICTs functioning as bridging mechanisms
Farmers operate in multi-faceted production environments. Enhancing the performance of the Ghanaian agricultural sector, therefore, requires improved information (knowledge) flows among agricultural stakeholders and improved business linkages. The major stakeholders in the agricultural system are knowledge technology providers and users. Their interaction and knowledge exchange need to be enhanced, along with that of other value chain actors who currently only have loose linkages (Adolwa et al., 2017;Asiedu-Darko, 2013;McNamara et al., 2014). The other main actors in the system are bridging organisations that are involved in facilitating interaction and linkages between stakeholders (Kilelu et al., 2011;World Bank, 2012). Bridging organisations are defined by Berkes et al. (2003) as organisations that provide an arena for knowledge co-production, trust-building, sense-making, learning, vertical and horizontal collaboration, and conflict resolution.
From an innovation systems perspective, bridging organisations are regarded as intermediaries, which are "persons or organisations that, from a relatively impartial third-party position, purposefully catalyse innovation through bringing together actors and facilitating their interaction" (Klerkx & Gildemacher, 2012, p. 221). For many developing countries, it has been argued that agricultural bridging functions are best suited to, and easily assimilated by, public extension organisations, even though other organisations (e.g., private extension organisations, non-governmental organisations (NGOs), farmer-based organisations, and research institutions) have been involved in the role (Kilelu et al., 2011). In the case of Ghana, for extension organisations to assimilate the bridging role in line with the AIS-based approach (Abdu-Raheem & Worth, 2016;Sigman, 2015), they "are required to expand their role from that of a one-to-one intermediary between research and farmers" to that which "creates many-to-many relationships to facilitate access to knowledge, skills, services, and goods from a wide range of organisations" (Kilelu et al., 2011, p. 89).
However, various other actors in agricultural systems can also take on bridging functions. These include sector-focused networks, trade associations, special government programmes, consultants, input suppliers, and, with direct relevance to this study, ICTs (Kilelu et al., 2011;Klerkx & Gildemacher, 2012). ICTs can serve as bridging mechanisms (Hansen et al., 2014;World Bank, 2012), and can be leveraged by extension organisations and other extension actors in support of functioning better as bridging organisations and engaging in AIS-based extension service delivery. Hansen et al. (2014) assess the ability of social media and other ICT-enabled tools to drive agricultural innovation based on six "social network functions": networking, cooperating, co-producing, crowdsourcing, discussing, and engaging. Using this framework, Hansen et al. (2014) engaged innovation systems experts to assess the extent to which different forms of social media and other web-based platforms (e.g., YouTube, ResearchGate, LinkedIn, Facebook, Twitter) support particular networking functions that may facilitate collaboration for sharing ideas and for mobilising knowledge and resources circulating in other arenas (Granovetter, 1973;Kaushik et al., 2018).

Intermediation
In the African context, ICTs have been found to facilitate aspects of AIS-based extension service delivery by enabling multiple actors to network and engage in joint needs identification, knowledge-sharing, and problem-solving to meet information needs in farming systems (Ajani, 2014;Fabregas et al., 2019;Munthali et al., 2018). Mobile applications have, for example, been recognised for their ability to improve value chain linkages (Ajani, 2014;Zwane, 2020), to build timely monitoring systems (e.g., with geo-referenced data) on environmental issues and production, and to provide timely advice to enable farmers to respond to farming challenges (Gbangou et al., 2020;McCole et al., 2014).
That said, it is important to note that, in general, most studies of the role of ICTs in agricultural extension focus on the use of specific ICT tools (typically mobile apps) to provide market, technical, and weather information to farmers, rather than on ICTs' impact, or potential impact, on the provision of AIS-based extension (Aker et al., 2016;Misaki et al., 2018). Furthermore, despite ICTs falling within the typology of intermediaries that can facilitate interaction and linkages between AIS actors to foster innovation, most studies of innovation intermediaries focus on the functioning and influence of other types of intermediaries, e.g., consultants targeting individual farmers and small and medium-sized enterprises (SMEs) in the agri-food sector; consultants targeting farmer collectives and agri-food SMEs; peer network brokers; education brokers; systemic intermediaries; and research councils (Kilelu et al., 2011;Kivimaa et al., 2019;Winch et al., 2007). Therefore, existing literature does not clarify which ICTs among those available in Ghana or other African countries are most capable of supporting the specific types of intermediation required to facilitate AISbased extension service delivery activities in these contexts. Additionally, there has been little consideration of how experts, from the academically oriented to the more location-specific and practice-oriented, look at the potential of various kinds of ICTs to augment extension service delivery.
To address these knowledge gaps, our study explored the views of communication and innovation scientists, development informatics researchers, and ICT4Ag practitioners on the current opportunities for ICTs to enhance intermediation functions within agricultural extension service delivery in Ghana.

Analytical framework: Intermediation capabilities
The framework we deployed in the study builds on the aforementioned social network functions framework of Hansen et al. (2014). Our framework modifies the Hansen et al. (2014) networking functions-engagement, discussion, crowdsourcing, networking, co-production and cooperation-by: • merging three overlapping functions (engagement, discussion, cooperation) into two broader functions (coordinating and co-creating); and • including additional functions (harvesting, matching, coordinating) relevant to facilitating AIS-based extension delivery.
Overall, we broaden the work of Hansen et al. (2014) to reflect networking as well as communication functions relevant to facilitating AIS-based extension service delivery, and we refer to these functions collectively as  Enabling content to be spread widely, alerting or attracting the interest of or raising the awareness of a large group of geographically dispersed actors Retrieving (information) Enabling actors to retrieve information (e.g., price, weather) from a central database or to retrieve documents out of a central repository

Harvesting (information)
Enabling the gathering of feedback, ideas, and opinions through the contributions of a large group of geographically dispersed actors e.g., crowdsourcing or polling Matching (actors to services) Enabling supply and demand linkages -actors are able to query, consult, or search information systems and connect to advice or services Networking (among actors) Enabling contact between actors so that they make direct connections and are able to interact to form new (business) relationships or reinforce existing relationships

Coordinating (actors)
Facilitating virtual multi-actor engagement 4 to provide open and live communication channels that enable discussion for coordinated action e.g., acting together towards a common purpose or engaging in joint problem-solving Co-creating (among actors) Facilitating a common working space for multiple actors to combine and contribute contextual knowledge or information, and engage in document sharing and information storage towards a tangible output

Source: Adapted from Hansen et al. (2014), with insights from Leeuwis (2004) and Howells (2006)
Taking the intermediation capabilities listed in Table 2 as a reference, this study sought to answer the following research questions: • How do experts assess the extent to which different ICTs support specific intermediation capabilities? • What type of consensus or dissensus do experts reach over which ICTs can support which specific intermediation capabilities? • What factors are contributing to consensus and dissensus among experts about which ICTs can support which specific intermediation capabilities?

Methods
In this section, we report on the scoping exercise that was conducted to identify the ICTs currently being used in the Ghanaian agricultural system. The outcomes of this scoping study provided the basis for engagement with experts on their views. The section also explains the set-up of the Delphi-inspired study, which was designed to establish experts' consensus and dissensus with respect to the intermediation capabilities of the different types of ICTs that were identified through the scoping exercise.

Scoping exercise
We reviewed ICT4Ag literature on Ghana, and engaged with organisations rolling out ICT initiatives discovered in the literature, in order to identify the ICTs being used in the Ghanaian agricultural system (Aker et al., 2016;Gakuru et al., 2009;Qiang et al., 2012;World Bank, 2014). Through these scoping activities we developed an inventory of ICT4Ag platforms (see Appendix). We then examined the inventory and were able to identify nine different types of ICTs in use (see Table 2).

Delphi-inspired expert consensus-building study
Building on the scoping study, we developed an expert consensus-building method that was inspired by the Delphi study approach. A Delphi study is defined as "a method for systematic solicitation for judgements on a particular topic through a set of carefully designed sequential questionnaires interspersed with summarised information and feedback of opinions derived from earlier responses" (Chu & Hwang, 2008, p. 2828. It involves a "group facilitation technique, which is an iterative multistage process, designed to transform opinion into group consensus" (Hasson et al., 2000, p The content validity of the Delphi is enhanced by avoidance of data collection in a group setting where more dominant actors' opinions may be captured (Hasson et al., 2000). Furthermore, Delphi data collection involves more than one round of questioning, which increases concurrent validity of the method (Hasson et al., 2000), and because consensus-building is the objective of the Delphi approach, the number of these rounds is undefined and dependent on when consensus emerges or increases among participants (Benitez-Capistros et al., 2014). According to Hasson et al. (2000) and Doria et al. (2009), acceptable majorities in a Delphi-derived consensus can range from a basic majority (50-59%) to a low (60-69%), medium (70-79%) or high (≥ 80%) majority.
There are variations in the set-up of Delphi studies (Allen et al., 2019;Chu & Hwang, 2008). Our Delphi-inspired expert consensus-building method involved two rounds, and for each round the expert panel composition varied to fit a particular purpose (see Figure 1).

First round: Honeycomb evaluation by internal panel of experts
The first round involved a small internal panel composed of the research team: four experts in the domain of communication and innovation science. The experts each individually engaged in a honeycomb evaluation to assess the intermediation capabilities of the various ICTs (see example in Figure 2) and ranked the different ICTs in relation to the seven intermediation capabilities in our framework. The ranking was based on a Likert scale ranging from "0" (no capability to support) to "5" (strong capability to support). Based on the individual honeycomb evaluations, we calculated the average rank assigned by the experts to each type of technology for each type of intermediation capability. The aggregated and averaged results of the four internal experts' honeycomb evaluations were then presented to the entire internal panel to facilitate a convergence forum. The convergence forum gave the experts the opportunity to reflect on the aggregated results in relation to their individual responses, discuss areas of divergence, and ultimately reach agreement on the indicative intermediation capabilities of the different ICTs. The forum also enabled the experts to identify the significant results of the honeycomb evaluation from which 16 propositions were developed for the second round of the expert consensus-building method.

Second round: Online survey of 11 external experts
In the second round, the 16 propositions were packaged into a questionnaire format, using a five-point Likert scale that ranged from "1" (strongly disagree) to "5" (strongly agree). The questionnaire was presented to a broader expert panel made up of Ghana-focused development informatics researchers and ICT4Ag practitioners.
Potential respondents were identified from a list of invitees to a workshop convened in Accra, Ghana by the Environmental Virtual Observatories for Connective Action (EVOCA) research programme in April 2019, which targeted Ghanaian agricultural stakeholders. Additional researchers and practitioners were identified as potential respondents through a search in the SCOPUS abstract and citation database of peer-reviewed research literature. The search was composed of two steps: (1) a search using the function "(mobile technology or ICT) AND (extension or agriculture) AND (Ghana)"; and (2) screening the articles captured in the search to establish whether they were on topic and, where applicable, to identify authors who could be invited to participate in the survey.
In total, 22 potential respondents-13 researchers and nine ICT4Ag practitionerswere identified and sent an email invitation to engage in the study by completing the online questionnaire, which was administered via the web-based platform Google Forms. Of the invitees, 11 (five researchers and six practitioners-see Table 3) responded to the questionnaire during the two-week period given for responses. For round two, the descriptive statistics analysed for each proposition included the mean (qi), the median (Q2), and the frequency of ranking for each point on the Likert scale. Based on these statistics, we determined whether there was positive consensus (agreement) or negative consensus (disagreement) about a proposition, or whether there was dissensus (varied ranking or polarisation) about a proposition. We considered three criteria to determine whether consensus was reached and to determine the direction of the consensus for each proposition (Table 4). These criteria were (1) the position of the mean on the Likert scale (Chu & Hwang, 2008); (2) the position of the mean in relation to the median in the data distribution (Chu & Hwang, 2008); and (3) the significance of the percentage of participants ranking a proposition on the Likert scale, ranging from low to medium to high to very high (Doria et al., 2009;Hasson et al., 2000).

First round of consensus-building
The first round of the expert consensus-building, with the four-person internal panel of experts, collated views on the intermediation capability (high to low) of each ICT identified in the Ghanaian agricultural system (see Figure 3). In terms of the ICTs with a high capability to support intermediation capabilities (ranking > 3), the aggregated results of the honeycomb evaluation show that interactive voice response (IVR) outbound technologies were viewed as having very high capability to support disseminating, and IVR inbound technologies were viewed as having high capability to support retrieving. In addition, short message service (SMS) push technologies were seen as having a high capability to support disseminating, and unstructured supplementary service data (USSD) technologies were viewed as having a high capability to support retrieving and matching. Furthermore, the aggregated results showed that social media messaging (SMM) technologies had a high capability to support harvesting and coordinating, and an intermediate capability to support all the other intermediation capabilities, excluding networking.

Focus group discussion
In addition to the expert consensus-building method, a focus group discussion was conducted to establish factors contributing to (positive or negative) consensus and dissensus (varying views or polarisation) over the propositions. The focus group discussion took place during the EVOCA programme's Ghana workshop. The workshop attracted 19 participants and, as part of the workshop proceedings, the participants were selectively split into four working groups that each comprised all the categories of participants present at the event (mainly various kinds of technology users). One of the working groups comprised five workshop participants who took part in the focus group: two public extension staff members, two ICT-based NGO representatives, and a small-scale farmer. We presented the aggregated questionnaire results to the focus group, and they reflected on the results and engaged in an open discussion on whether or not they agreed with them in general, and why. The discussion was recorded to facilitate thematic analysis of the plausible factors contributing to consensus and dissensus on the propositions. With respect to technologies found to have a low capability to support specific intermediation capabilities (ranking < 3), the panel of internal experts reached consensus that spatial (Spa) technologies generally had a low capability to support all the intermediation capabilities. The panel also reached consensus that SMS pull technologies, data management (DaM) technologies, and document management (DoM) technologies also did not rank highly (ranking > 3) in terms of their capability to support any intermediation. The assessment also found that all ICTs had a low capability to support networking.

Second round of consensus-building
Based on the aggregated results of the first round of consensus-building, the fourperson internal expert panel developed a number of propositions, 16 of which (see Table 5) were used to develop the online survey questionnaire for the second round. The propositions were also developed within a specific context to aid the panel of external experts in assessing which ICTs were likely to be best suited to facilitate certain communication and networking functions in extension activities. The internal panel (more academic-oriented), therefore, required the external panel of respondents (more Ghana-specific and practice-oriented) to envision themselves as district extension staff tasked by the "Ministry of Agriculture -Headquarters" to qualify or disqualify the preliminary assessment of the current capability and future potential of specific ICTs to improve extension service delivery involving rural farmers.

Experts' consensus on propositions
The results of round two showed that seven of the 16 propositions presented to the external experts were marked by positive consensus (Table 6). Additionally, the ques-tionnaire results showed that there was no negative consensus among the external experts about any of the propositions. Abbreviations: qi = mean; Q2 = median As seen in Table 6, there was positive consensus among the experts that: • IVR inbound technologies currently have the highest capability for harvesting information from farmers (P4), for supporting farmers in retrieving information (P7), and for matching farmers with advice and services (P11); • IVR outbound technologies currently have the highest capability for disseminating information to farmers (P1); and • SMM technologies currently have the highest capability to support coordinating between agricultural stakeholders (P14) including farmers, and intermediate-level capability to facilitate co-creating by these stakeholders (P15).

Experts' dissensus over propositions
The experts did not reach consensus on nine of the 16 propositions (Table 7). This dissensus was determined on the basis that the propositions failed to meet all three of the consensus criteria outlined earlier. Abbreviations: qi: mean; Q2: median; Q3: "middle" value in the second half of the rank-ordered data Specifically, as seen in Table 7, it was found that experts had varied views on: • whether IVR inbound technologies currently have a higher capability than USSD technologies to facilitate the harvesting of information from rural farmers (P5); • the current capability of USSD technologies to facilitate retrieving of information by rural farmers (P8), or to facilitate matching of farmers with agricultural services (P10); • the current capability of all the technologies identified to support networking between rural farmers and other agricultural stakeholders (P12); • the future potential of SMM technologies to facilitate disseminating, harvesting and retrieving information targeted at or involving farmers (P3, P6, P9); and • the future potential of SMM technologies to support networking and co-creating between agricultural stakeholders (P13, P16).

Consensus on high capabilities of IVR technology
The focus group discussion revealed two factors contributing to the external experts' consensus on the high intermediation capabilities of IVR inbound and outbound technologies at present, as described above. One factor was that IVR technologies operate on basic and feature mobile phones (i.e., non-smart phones) that are accessible to rural Ghanaian farmers. The other factor was that IVR technologies, unlike SMS or USSD technologies, generate audio as opposed to textual content. This makes them more compatible with the generally low literacy levels of the farmers. In the words of one focus group participant: At the moment, IVR is known widely and used because it is programmed in a language that the end user understands. It does not involve text messages and is available on any kind of phone.

Consensus and dissensus on capabilities of SMM technology
The focus group also established the reasons behind experts' consensus on certain intermediation capabilities of SMM technologies and dissensus on other SMM capabilities. The consensus on the high capability of SMM technologies to support coordinating between agricultural stakeholders, at present, was found in the focus group to be a result of the view that SMM technologies facilitate, to a greater extent than other ICTs, rapid and easy interaction and feedback. Another reason for the consensus on the high capability of SMM for coordinating, at present, was the assumption that most coordination functions involve service providers (e.g., extension agents) working together with lead farmers, i.e., with lead farmers who, because they have higher literacy levels and greater financial means than the average farmers, are likely to have access to the smartphones necessary for the use of SMM technologies. According to a focus group participant: Meanwhile, the consensus on SMM technologies' current capability to support co-creating was that the capability is only at an intermediate level. On this point, it was found in the focus group that the experts took into consideration that many rural farmers currently lack access to smartphones that support the use of SMM technologies, and also that the generally low levels of literacy of farmers affects their ability to engage intensively with or on SMM technologies. In relation to these challenges with farmers taking advantage of SMM technologies, some experts pointed to alternative communication mechanisms, such as face-to-face meetings, being more appropriate than SMM, at present, for facilitating co-creation involving rural Ghanaian farmers.
Moving to the factors contributing to the dissensus regarding the future intermediation capabilities of SMM in disseminating, retrieving, and harvesting information, the variation in views was found in the focus group to be due to different levels of optimism among the focus group participants on rural farmers' future access to smartphones and the farmers' future literacy levels. The more optimistic respondents were confident in farmers' increased access to smartphones and increased literacy over the next 10 years. Representing the optimistic view, one focus group participant argued as follows: [...] but it [the situation] is not static. Maybe in 10 years the youth will become more active farmers and be more inclined to use WhatsApp.
However, pessimistic views were also expressed. For example, one focus group respondent stated: [...] right now it has been tagged that you [farmers] need a lot of money to get a smartphone, let alone the [poor] internet connectivity within rural areas.

Intermediation Capabilities of ICTs in Ghana's Agricultural Extension Delivery
Another focus group participant added an additional pessimistic view: I am not even looking at the costs of [mobile data] bundles. Let's look at how old the active rural farmers will be and what their educational level will be. When you talk about the farmers now, most of them are within the range of 30-35 and they will be 40-50 in the next 10 years. In the next 10 years we will be dealing with the same crop of farmers. Therefore, I do not expect to see significant changes in relation to their adoption of such new technology [SMM technologies].

Discussion and conclusion
The starting point of this study was that ICTs have the capacity to respond to information-and interaction-related needs in Ghana's agricultural extension service delivery. Through the inputs of a total of 15 varied experts in two rounds, we assessed the capability of nine types of ICTs operating in Ghana to support specific communication and networking functions (intermediation capabilities) that are required to facilitate AIS-based extension service delivery. In this section we highlight the results, specifically instances of positive consensus and of dissensus, in experts' views on the intermediation capabilities of the ICTs identified, and discuss these instances with reference to the reasoning provided by the focus group participants and in the context of existing literature. Based on this analysis and discussion we point out opportunities for specific ICTs to support certain communication and networking functions that are required to facilitate AIS-based extension service delivery, as well as alternative scenarios. Finally, this section reflects on the validity of the Delphi-inspired research design and highlights potential areas for future research.

Positive consensus over technologies' intermediation capabilities
Below we discuss and identify opportunities for IVR and SMM technologies to support intermediation.

IVR technologies
The results show that experts reached positive consensus on the high capability of IVR technologies to support disseminating, retrieving, and harvesting information, at present, and to support matching actors to services targeted at rural farmers, also at present. These findings are congruent with previous research pointing to IVR technology having great potential to reach farmers directly (Dittoh et al., 2013;Mc-Namara et al., 2014). It is clear that many scientists, researchers, and practitioners view IVR technologies as being appropriate for supporting these specific communication functions involving rural communities. This is largely because, as found in our focus group discussion and also as argued in the literature, these technologies are audio-based and thus fit rural farmers' literacy levels, and these technologies are supported by the low-cost basic and feature mobile phones that most rural farmers can readily access (Aker et al., 2016;Dittoh et al., 2013;Schmidt et al., 2010).

SMM technologies
We also found that there was positive consensus among experts on the high capabilities of SMM technologies to support coordinating between farmers and other agricultural actors at present. Therefore, in this case, it is also clear that various experts, including Fabregas et al. (2019), see opportunities for SMM technologies to support the coordination of activities involving farmers and other agricultural actors. Furthermore, according to the focus group and other studies, the consensus reported is due to SMM technologies enabling speedy information dissemination and immediate feedback (Bennett & Segerberg, 2012;Munthali et al., 2018;Stevens et al., 2016).
However, despite the full spectrum of SMM technologies' features, the study found that these technologies only have the potential to support a certain type of coordinating-not as defined in Table 2. The focus group reported that SMM technologies tended to be used by lead farmers to interact with agricultural stakeholders (other than farmers) on a one-on-one basis. Specifically, focus group participants indicated that lead farmers use SMM technologies for speedy one-to-one communication with these other agricultural stakeholders to support aspects of coordination (e.g., organising meetings)-as Martin and Hall (2011) also report-as opposed to using the technologies to facilitate many-to-many communication to support, for instance, multi-actor (stakeholder) knowledge exchange and joint problem-solving. The SMM technologies were not cited as having the potential to facilitate virtual, multi-actor open and live communication for coordinated action to solve emerging problem. Thus, there are indications that the possibilities of leveraging SMM technologies' ability to facilitate multi-actor discursive spaces are currently limited in Ghana's extension practice.
Last, various experts were of the collective view that at present SMM technologies have only intermediate capabilities to support co-creating involving rural farmers and other agricultural stakeholders. Thus, the experts saw SMM technology as currently having neither high nor low capability to support the co-creating function, which requires multi-actor engagement and many-to-many communication. The focus group participants provided insights into factors contributing to this survey outcome. Certain focus group discussants were optimistic about farmers' educational levels and smartphone access increasing in the near future, thus allowing farmers to engage with SMM technologies that have the technical capacity to support engagement and communication for co-creating. Other focus group participants held a pessimistic view on the matter.

Dissensus over technologies' intermediation capabilities
Experts did not reach positive or negative consensus on a number of propositions. They had a mix of positive, neutral, and negative views on these propositions. We now discuss and identify these instances of dissensus in relation to intermediation via IVR, USSD, and SMM technologies.

IVR technologies
There was dissensus among the experts in our study on whether IVR inbound technologies have a higher capability than USSD technologies to support harvesting, at present. At the same time, and as already mentioned, there was positive consensus among the experts that IVR inbound technologies have the highest capability, among all the technologies identified (including USSD), to support this communication function. A plausible explanation for these inconsistent findings is that experts judged IVR inbound and USSD technologies, comparatively, as possessing equal technical abilities to support harvesting, but when explicitly asked which technology had the highest potential to retrieve information directly from farmers in the Ghanaian context, they identified IVR inbound technologies. Moreover, the existing literature, the analysis in the previous section on positive consensus, and the focus group inputs all point to a finding that IVR inbound technologies are best suited to support direct harvesting of information from Ghanaian rural farmers as these technologies support audio content and operate on basic mobile phones (Aker et al., 2016).

USSD technologies
We found that there was no consensus among experts regarding USSD technologies' capability, at present, to support farmers in retrieving information or matching actors (farmers) to services over other ICTs. This dissensus was based on the competing pessimistic and optimistic views of experts on farmers' literacy levels. Meanwhile, the focus group and the literature point to IVR technologies having higher capacity to support these communication functions in comparison to other technologies. For example, Perrier et al. (2015) state that IVR technology is better-suited than USSD to reach literacy-constrained audiences.

SMM technologies
There was also dissensus among experts on the future potential of SMM technologies to support disseminating, harvesting, and retrieving targeted at rural farmers, or networking and co-creating involving rural farmers and other agricultural stakeholders. This outcome could be attributed to the competing and diverging views of experts, as already mentioned above, on the future dynamics of farmers' access to, and use of, the mobile smartphones that support these technologies.
For the networking function specifically, the findings above related to SMM technologies-and the dissensus found on the propostion that all the technologies identified have low capability to support networking at present-lead to the conclusion that it is unclear which ICTs are best suited to support the func tion.
Unlike the aforementioned findings on experts' views on the possibility of leveraging SMM technologies to support networking in the Ghanaian context, the Hansen study (Hansen et al., 2014) found that social media currently has high potential, in the European context, to support networking and co-creating. The difference between the Hansen at al. (2014) findings and those of this study point to two issues that require consideration. The first issue is that the findings of the European-focused study could largely be influenced by the context-a context in which farmers have higher literacy levels and easier access to smartphones than farmers in most African countries (ITU, 2021). The second issue is that at present, as suggested by this study's focus group participants, networking intermediation capabilities are likely to be best-supported, in contexts such as those found in Ghana, by alternative communication mechanisms such as conventional face-to-face meetings, which remain relevant in the functioning of agricultural systems where intensive interaction is required Materia et al., 2015). Such communication mechanisms have been cited (Molony, 2006) as trusted social networking methods that, in the African context, are the most appropriate modes of interaction given the prevailing literacy levels and types of mobile phones owned in rural agricultural settings (Dittoh et al., 2013).

Validity of the consensus-building method
It is necessary to reflect on the validity of the expert consensus-building method that we applied in this study. In line with Delphi's general principles, our consensus-building method included more than one round of individual responses by experts (Hasson et al., 2000). However, our approach deviated from a typical Delphi in that it did not require that the same experts be involved in each of the two rounds. For our method, each set of experts was engaged for the distinct purpose of one round, so that we fostered concurrent validity by aggregating the views of a small group of experts in the first round and then presenting these views, for affirmation and/or refutation, to a broader expert panel in a following round. We developed this approach so as to allow the views of the internal expert panel (communication and innovation experts) to be subjected to assessment by experts who are more engaged than the internal panel with the Ghanaian context, and so as to be able to establish consensus and dissensus among a wide range of experts. Furthermore, a Delphi study is typically considered valid based on the input of 16 to 60 experts (Hasson et al., 2000). However, lower numbers of experts have been reported in other Delphi studies (Benitez-Capistros et al., 2014). It is our view that the inputs of the 15 experts in this study provide valuable insights because the design of the consensus-building method fostered concurrence validity.

Future research
Opportunities for future research can be identified from this study. Further research could shed light on ICTs' application and role in supporting broader (AIS-based) extension service delivery. This study is an experts' assessment of the intermediation capabilities of technologies identified in Ghana and provides insights into how experts view specific ICTs' potential to support communication and networking functions relevant to AIS-based extension service delivery. Going forward, empirical research is recommended to establish how the technologies practically support extension activities involved in AIS-based extension service delivery, in a variety of contexts.
Based on the findings of this study and related literature, it is probable that certain ICTs can currently support certain AIS-based extension activities. IVR technologies may support the broadcasting of knowledge and early warning alerts to rural stakeholders as part of coordination efforts in problem-solving, and enable the stakeholders to retrieve knowledge and other information (e.g., on weather, prices) (Aker et al., 2016). IVR technologies could also match farmers with service providers and suppliers, as well as allow for the harvesting of information from farmers and other rural stakeholders (Viamo, 2020) as inputs for systemic problem diagnosis. On the other hand, the technologies identified do not seem to have the potential to support multi-stakeholder engagement for collaborative problem diagnosis and problem-solving. This is based on two considerations: (1) this study found no clarity on whether any of the ICTs identified support the networking function; and (2) SMM technologies currently have the potential to largely support only one-to-one communication and coordination. Furthermore, given this study's finding that SMM technologies have only an intermediate capability to support co-creating, it is therefore unclear whether these technologies can fully support the combining of knowledge to facilitate innovation among agricultural stakeholders in extension practice.