We collected our data in a French context 4
, in a French services company, on three
organizational levels (operator, middle manager and top manager) involved in co-op
expecting to be qualified respectively as a bus driver (underbaccalaureate level), a supervisor
(undergraduate level), and a manager of a business unit (graduate level) for the test sample.
The control group sample contained the same organizational levels but with employees who
joined the company but who did not take co-op. We checked the possibility of comparison
between the two samples with a high level of description (gender, study level, duration of
employment). The samples have been selected with a census method and following the
advice of Henry (1990) for dealing with small samples, for the longitudinal sample we
selected all co-op students employed at the company for the sample.