Innovation platforms (IPs) are a way of organizing multistakeholder interactions, marshalling ideas, people and resources to address challenges and opportunities embedded in complex settings. The approach has its roots in theories of complexity, the concept of innovation systems and practices of participatory action research. IPs have been widely adopted across Africa and beyond in recent years as a "must have" tool in a range of "for development" modes of agricultural research. Our experiences with establishing and facilitating nine IPs in local settings in west and central Africa contribute to understanding factors that impact on their effectiveness. The nine IPs were variously focused on developing dairy, crop and/or meat value chains by strengthening mixed crop-livestock production systems or seed systems. Using case study methods, we identified variables that contribute to explaining the performance of these IPs in relation to six domains of change in the agricultural system and the sustainability of changes. Thematic analysis was guided by a conceptual framework which grouped variables into four categories (context, structure, conduct, and process) that interact to influence IP performance. Stronger market connections and value chains were generated through some of these IPs but the most prevalent changes overall were in farm productivity and technical knowledge of producers. The structures evolved in some IPs, akin to those of producer collectives, suggested they were filling an institutional gap locally. The effect of the IPs on deeper level institutions that influence agricultural systems and food security was modest, constraining prospects for the IPs to generate impact at scale. Impacts from the IPs on research and development organisations were uncommon but had transformative significance. Our conceptual framework did not offer optimal guidance to understanding how the many variables that contributed to performance of these IPs combined and sequenced, but the pattern of interactions was consistent with increased social capital being the prime mediator for change. Achieving greater prospects for transformational

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Extensive herding is an important activity in northern Cameroon, in terms of both the local social economy and local land management. However, this activity is strongly linked to the availability and accessibility of fodder resources. Due to territorial processes, such as land clearance and wood harvesting, this resource is receding and pasturelands are becoming fragmented. Herders are facing new challenges to secure their livelihoods, and, in this context, fodder trees are emerging as a key resource, allowing herds to subsist up to the end of the dry season. Increasingly, trees are playing a significant part in the herders’ strategies to feed their herds in time and space and to ‘root’ their activities to particular lands. This trend requires an analysis of the importance of fodder trees in the definition of territorial strategies operated by herders in northern Cameroon, in the context of various herding systems (nomadic herding, agro herding using transhumance, and settled agro herding). A discussion of herding strategies needed to address the decreasing access to fodder resources highlights the problems of current extensive herding systems and leads to proposed alternatives.

In Sudano-Sahelian Africa, Fulani pastoralists who settled down massively in less densely populated zones during the 1970s and 1980s have recently increased the mobility of their herds in response to an extension of cropping areas, a shortage of pasture and problems resulting from crop damage by cattle. Today, they annually exploit a set of areas located both near to and far from their dwellings that constitutes their 'herding territory'. This article aims to clarify how Fulani pastoralists conceive, organize and manage their herding territory and to discuss the future of pastoralism within the local and regional legal framework. The study was carried out in northern Cameroon and western Burkina Faso over three years following a participatory research approach. The results show that the herding territory is mainly composed of three sub-elements endowed with different access rights: the 'attachment territory' and 'peripheral territory', with rangelands that are exploited by 'house herds' on a daily basis, and the 'territories distant from the residential area' that serve for transhumance and the relocation of a second group of herds known as the 'bush herd'. These territories and herds are managed by mobilizing local knowledge and juggling a combination of factors, including the availability of plant biomass on different pastoral units, access rights and agreements with local stakeholders regarding resources, the date the rains arrive and the progress of sowing and harvesting in the fields. If pastoral systems are to be maintained in a sustainable manner in this region, any change to existing spatial arrangements must take into account the knowledge, expectations and needs of pastoralists on one hand and the evolving legal and institutional framework in western Africa on the other.