This report presents the results of thestudy on the demobilization and reinsertion of excombatantsfrom illegal armed groups in Colombia. The report describesand analyzes the Colombian case, compares it withinternational experience, discusses critical issues of thecurrent program, and presents options to improve its designand implementation. The study responds to a request by theColombian government to conduct an assessment of theprevious and current approaches to demobilization andreinsertion in Colombia and, in light of national andinternational experience, to present options to improve theprogram. This study relied principally on secondary data andinformation from existing studies, essays, and pressarticles produced by government agencies, nongovernmentalorganizations, United Nations and bilateral agencies,specialized analysts, and media. The analysis also usedprimary information collected for the study, including: (1)information from interviews with government andnon-government sources about the current condition ofindividuals demobilized during the 1990s; (2) the profilesof a sample of young excombatants (18-26 years old) enrolledin the current reinsertion program in Medellin and Bogota;(3) the assessment of the demobilization and reinsertionexperience of the 1990s as viewed by leaders of existingfoundations from four of the demobilized groups; and (4) aspecial work session held with 50 representatives fromdiverse private-sector associations and businesses. Thisstudy assesses Colombia's experience using a frameworkof five interwoven phases from armed conflict to peace:prevention, demobilization, reinsertion, reintegration, andreconciliation. This framework together with accumulatednational and international best practices in technicalaspects of the operations of disarmament, demobilization,and reinsertion (DDR) programs are used in the analysis ofthe current Program of Demobilization and Reinsertion (PDR).