... existing data, which are not always the ones that he/she would need for a prop-er testing of the hypothesis he/she wants to confront.Econometric methods are, on the other hand, heterogeneous regarding ... strength16of each one, as well as with the differences in firms’ strategies.The authors confirmed the hypothesis of a relationship between the strength and the use of dif-ferent appropriability mechanisms ... (amelioration of position in cooperation arrangements, improved access to cap-ital markets, exchange potential, licensing) and “incentive” (motivation of staff, internal per-formance indicator) categories.Duguet...