In their Self-Determination Theory (SDT), Deci and Ryan (1985) posit autonomy, competence, and relatedness as three intrinsic needs that contribute to well-being throughout the lifespan. Addressing the argument that the universality with which SDT makes its predictions may ignore critical developmental differences, Ryan and Deci (2000) contend that although these three needs are developmentally persistent, their relative salience may in fact vary across the lifespan. This became apparent with the finding that fulfillment of some needs was inconsequential in the prediction of depressive symptoms in a sample of children and that the experience of a balance of overall need satisfaction across important life contexts accounted for well-being over and above individual need satisfaction in a sample of adolescents (Milyavskaya et al., 2009;Veronneau, Koestner, & Abela, 2005). Despite these advances, a concrete examination of the relative salience of intrinsic needs has yet to be examined in a developmentally comparative manner. Thus, the objective of this thesis was to test the applicability of SDT across developmental periods by differentiating children and adolescents on the importance of individual needs (i.e., autonomy, competence, relatedness) and the role of balance across contexts (i.e., home, school, peers) in predicting depressive symptoms.