This paper, written in one day, reflects the author's personal experience of facilitating participatory technology development (PTD), focusing on a case study in India. The objectives of PTD are defined as to improve the capability of a farming community (i) to develop appropriate agricultural technology, (ii) to define their problems, (iii) to identify alternative solutions, (iv) to systematically test alternative solutions (designing, implementing, monitoring and evaluating tests). PTD is briefly compared with 5 other types of agricultural change process, and the PTD process is described in detail. A number of potentials and constraints of PTD are discussed. One conclusion is that some types of problem were more easily addressed by PTD, while many problems could not be solved by PTD, particularly since the facilitating organisation paid insufficient attention to problems in the wider farming community. The author candidly acknowledges aspects of the process which may have been over-influenced by the facilitating organisation. The author's reflects that it should be recognised that the facilitator is not a 'blank sheet', but has its own interests (e.g. sustainable development) which may differ from those of the community participants. These interests should be made transparent to partner organisations. However, these goals are not discussed with farmers, with whom the focus is on 'building an open and trusting relationship'.