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To critically review the methodologies used to study relapse in substance abusers and compare some of the findings these methodologies have produced. Representative studies that have used retrospective, prospective, or near real time methodologies to study antecedents or consequences of relapse are presented and the strengths and weaknesses of each methodology are reviewed. Limitations in the ability of substance abusers to accurately report internal states are considered. Degree of convergence in findings across methodologies is examined. Retrospective reports can provide perhaps the most detailed accounts of circumstances and experiences leading up to relapse, but are also more likely to be inaccurate due to the limitations of memory. Prospective studies are less likely to be affected by memory problems, but may not capture factors that immediately precede relapse. The …