Value chain projects face several challenges. One is how to select commodities, locations, and interventions based on available evidence from the country. Another is how to evaluate the impact of value chain projects. This seminar will share the experience of Tam Nong Support Programme in Viet Nam and explores ways to implement an expanded RIMS with a control group without overburdening project management and why this improves our ability to evaluate impact. In addition, it examines the potential for using agricultural census data to identify commodities and locations for value chain programmes.