“…They evaluate whether the sport makes them happy, a credit attributed to the sport by themselves or by their reference groups, or consider what they gain or lose by do-ing sports, or whether they are made to give up OPA because of reasons which go beyond their capacity to solve them satisfactorily (injuries, increased costs, or time confl icts). This is refl ected, for example, in studies already off ering comprehensive theories and integrated constructs (Deci & Ryan, 1985Klint & Weiss, 1986;Leonard, 1998;, 2007Ntoumanis, 2012;Quested et al, 2013). Others authors try to search for solutions and address specifi c motives which infl uence dropouts of OPA such as Orlick (1974), LeBlanc and Dickson (1997), Jõesaar, Hein and Hagger (2012) or again Quested et al (2013).…”