I have examined different kinds of data collection that produce more fragmented biographical data and call for specific forms of analysis. The paper I wrote with Najim Jamal on: Interval-censored event history analysis in 1996, examines the validity of some of these analyses (see the joint file). They may be udertaken using the Demographic Panel of INSEE, the survey on social, geographical and wealth mobility in 19th and 20th century France, ...