• Self-concept formation, stability, and identity exploration during adolescence, emphasizing self-image fluctuations, role conceptualization, and early philosophical reflection characteristic of cognitive development. [10], [9], [8], [11], [6]

• Social influence patterns in adolescence, focusing on how peer norms and parent–teen cross-pressures steer choices, conformity, and risk behaviors in everyday settings. [7], [13], [14]

• Adolescence as a sociocultural transition, analyzing the adolescent's role evolution within families, schools, and broader society, including historical and policy perspectives. [1], [3], [4], [19]

• Substance use trajectories during adolescence, linking onset and progression of drinking and drug use to psychosocial attributes and transitional life events. [2], [20], [14]