Book excerpt: Priority assessment for commodity improvement programmes has received methodological attention, yet innovation is needed for other, newer areas of research which have impact pathways that are harder to predict. Focusing on priority setting practices utilized in different international agricultural research institutes, this book discusses real world experiences and innovations with priority assessment methods. Chapters present approaches that have been used to articulate, explore and assess impact pathways and research priorities, while also considering their strengths and weaknesses and drawing together methodological lessons.