"Memory Defficiencies" in Victimization Surveys: Responses in retrospective surveys are subject to different biaises associated largely with problems of memory recall. In victimaziation surveys, it is necessary to provide exact dates for the events mentioned. Among errors of date by respondents, Wesley G. Skogan distinguished three forms of chronological displacement (telescoping). On the basis of two victimization surveys in France, it is possible to show evidence for two of these forms (backward telescoping towards the reference period and forward telescoping within the period of reference), but not for the third (forward telescoping toward the period of reference). However, a more detailed analysis of one of these surveys reveals the possible influence of the seasonal variation of delinquency on the survey responses.