This guide describes, in fairly simple terms, the market research that agro-processors can carry out, and some of the ways of doing such research. The guide is addressed to entrepreneurs and companies who are planning to develop or expand medium-sized agro-processing businesses. It is also intended to be used by government agencies, extension workers and non-governmental organizations (NGOs) who are supporting individuals and groups planning to set up small rural processing ventures. The guide has been used successfully in training programmes and training courses.