“…The effect of these programs on the health of the youth is, besides the quality of the program itself, also dependent on the quality of implementation. The reach and implementation of school-based health promotion programs is, however, not optimal (Bessems, van Assema, de Vries, & Paulussen, 2014;Peters, Kok, Ten Dam, Buijs, & Paulussen, 2009;Schutte et al, 2014;Forman et al, 2009). Figure 1 shows the implementation process of school-based programs when program developers do not intervene in the process; only 70% of the target population is aware of the program, 50% decide to use it (adoption), 30% actually use it (implementation), and a small 10% continues to use the program in the long-run (continuation) (Paulussen, Kok, Schaalma, & Parcel, 1995;Paulussen, Kok, & Schaalma, 1994).…”