(1) Background: This study aims to explore the usefulness of personal construct psychology as a comprehensive framework and assessment tool to embrace a diversity of self-knowledge organization constructs, and to account for developmental differences across adolescence. (2) Methods: The repertory grid technique was used to measure self-knowledge differentiation, polarization, discrepancies between Actual Self, Ideal Self, and Others, and implicative dilemmas, a particular kind of intrapersonal conflict. Data were collected from two samples of early and late adolescents, respectively. (3) Results: Globally, they showed that the organization of self-knowledge was different in both samples. In particular, older adolescents revealed a less polarized self-knowledge. In addition, they tended to construe higher Actual-Ideal self-discrepancies and to present more internal conflicts. No differences were found between early and late adolescents concerning global differentiation and the discrepancies between the self (Actual and Ideal) and the Others. (4) Conclusions: Despite the limitations of the study (e.g., small sample size, cross-sectional design), these novel results support the suitability of the repertory grid technique to capture developmental changes in self-knowledge organization during adolescence, as well as the explanatory potential of personal construct psychology to advance their understanding.
Keywords: adolescence; cognitive conflict; identity; personal constructs; self.