This discussion synthesis, How To Use Market Assessment Information To Design and Implement a Business Development Services Market Development Program, is a product of the collaborative, learning-oriented forum that the SEEP Practitioner Learning Program (PLP) in Business Development Services (BDS) Market Assessment (MA) provides—in this case, a moderated, e-mail-based discussion to reflect critically on the question of how market information can inform the design and implementation of interventions to develop particular BDS and product markets. This e-mail-based discussion was the culmination of a two-year learning process in which participating organizations planned and conducted market assessments and used the resulting information in piloting market development interventions, while sharing their challenges and lessons with PLP colleagues throughout the process. The e-mail-based discussion was invigorating and thought provoking, as the following pages illustrate. The discussion generated information and ideas that were of immediate use to the participants in piloting market development interventions. The discussion was also one of the critical last steps in enabling the PLP to address the learning agenda it had set out at its initiation—a set of questions that is relevant to individual programs in the PLP, cuts across these individual programs, and resonates with the wider BDS field. The discussion assisted PLP participants in beginning to synthesize their journey of discovery by exploring and documenting experiments in conducting and using market assessments to design better programs and more targeted interventions that will develop sustainable BDS markets for microenterprises.