“…To assess engagement, items were chosen related to (1) enjoyment, (2) development, (3) challenge, (4) autonomy, (5) richness and (6) control. In Table 3, these items are grouped a priori according to previously obtained factor analytical results (Rozendaal et al 2009a(Rozendaal et al , 2009b. Further, two additional items are included in the engagement questionnaire.…”