This paper reports on the 'ACIAR cassava project in Indonesia', where a farmer participatory approach was used in an effort to increase the productivity of cassava-based cropping systems via adoption of higher yielding varieties and improved cultural practices. The report commences with a brief history of cassava research and development efforts in Indonesia, before providing quite an extensive methodology section outlining the farmer participatory research trials that were conducted. Trials were conducted on both experimental stations by the project team, and on farmers' fields by farmers with project staff providing extension support. They focussed on soil fertility management, plant spacing and nitrogen fertilization for leaf production, varietal evaluation and improvement, and on-farm animal feeding. The paper contains a simple to understand flow chart of the farmer participatory model used, before outlining the project achievements against the project objectives. Data obtained during the trials is presented in numerous tables with some analysis of the results. Conclusions for cassava in the trial areas are presented, along with some recommendations for future research. The authors accurately conclude that a longer timeframe is required to fully determine the clear impacts from projects delivering technology transfer.