This publication provides guidance on how to plan and conduct a joint evaluation of development programmes when more than one donor agency is involved. The emphasis is on practical guidance, and it will serve as a useful tool for those who seek to promote joint evaluation and collaboration among development co-operation agencies. Such evaluations are becoming increasingly important at a time when the implementation of the partnership strategy is taking ever deeper root in the management cultures of agencies. With the enhanced role of partnership in the implementation of development programmes we can expect a growing demand for joint evaluation and for lessons learned from various modalities of jointly implemented development co-operation.