This book is the product of the projects "Farmers' Strategies Regarding Agricultural Diversification" (1993-1995) and "Agricultural Diversification and Food Crop Trade: Their Implications to Agricultural Policies in Southeast Asia" (1994-1996), both supported by CIRAD and the Government of France. It describes the first project attempting to apply the MATA methodology in a country like Indonesia. As constructed, the Multilevel Analysis Tool for Agriculture is able to answer various policy questions and gives the opportunity to users to make intensive simulations by themselves.