One of the key developmental tasks in adolescence is to develop a coherent identity. The current review addresses progress in the field of identity research between the years 2010 and 2020. Synthesizing research on the development of identity, we show that identity development during adolescence and early adulthood is characterized by both systematic maturation and substantial stability. This review discusses the role of life events and transitions for identity and the role of micro‐processes and narrative processes as a potential mechanisms of personal identity development change. It provides an overview of the linkages between identity development and developmental outcomes, specifically paying attention to within‐person processes. It additionally discusses how identity development takes place in the context of close relationships.

Adolescence is a period of rapid biological and psychosocial changes, which have a salient impact on parent–child relationships. Parents and adolescents have to reorganize responsibilities and move toward a more egalitarian relationship. Although conflicts between parents and children become more frequent and more intense during adolescence, these conflicts are also thought to be a means to negotiate relational changes. The short-term dyadic processes that occur during conflict interactions are important in the development of parent–adolescent relationships. Parent–adolescent dyads with more emotional variability during conflict interactions tend to adapt effectively and reorganize their relationships in response to the developmental needs of adolescents. Thus, parent–adolescent conflicts are adaptive for relational development when parents and adolescents can switch flexibly between a range of positive and negative emotions.

This longitudinal study examined bidirectional paths between perceived parent-adolescent relationship quality and depressive symptoms, as well as the moderating role of sex, age, and personality type. 1313 Dutch adolescents (51% girls) from two cohorts (923 12-year olds and 390 16-year olds at Wave 1) reported on their personality, depressive symptoms, and perceived relationship quality to parents in four waves. Consistent with a relationship erosion perspective, depressive symptoms negatively predicted perceived relationship quality with parents. Relationship quality to mothers predicted depressive symptoms for boys and girls, but relationship quality to fathers predicted depressive symptoms only for boys. Personality type only moderated initial associations between relationship quality with mothers and depressive symptoms, which were stronger for Overcontrollers and Undercontrollers than for Resilients. Results thus reveal a pattern of mutual influence between perceived relationship quality and depressive symptoms that is moderated by the interplay among parent and adolescent sex and adolescent personality type.

One of the key developmental tasks in adolescence is to develop a coherent identity. Studies have increasingly begun to go beyond the study of mean level identity change and examine the underlying mechanisms of identity development at the intraindividual, microlevel, that is, at the level where development is taking place: within the person, in here and now experiences and relationships. Identity development during adolescence is characterized by both systematic maturation and substantial stability. Life events and transitions, as well as accumulating real-time experiences, might play a role in identity development. Optimal development of identity is embedded in high-quality family relationships and friendships in which constructive narrative processes take place.

The COVID‐19 pandemic has had a strong impact on adolescents worldwide. This special issue aimed to increase our understanding of the factors that explain interindividual differences in how adolescents are affected by the pandemic. The special issue includes 21 empirical articles from four continents on the role of the pandemic in changes in emotional, social, and academic adjustment during adolescence. The studies demonstrate that many adolescents experienced increased depressive symptoms, negative affect, and loneliness, and lower academic adjustment during the pandemic, particularly those that were already at risk before the pandemic. At the same time, many adolescents had individual, family, and community resources that made them resilient and helped them to continue to function well despite the adverse circumstances.

This 5-wave longitudinal study examines linkages over time between adolescents’ perceptions of relationships with parents and friends with respect to support, negative interaction, and power. A total of 575 early adolescents (54.1% boys) and 337 middle adolescents (43.3% boys) participated. Path analyses mainly showed bidirectional associations between adolescents’ perceptions of parent–adolescent relationships and friendships with a predominantly stronger influence from parent–adolescent relationships to friendships than vice versa in early to middle adolescence and an equal mutual influence in middle to late adolescence. The findings support the theoretical ideas that perceptions of relationships with parents generalize to perceptions of relationships with friends and that relationship skills and principles of adolescent friendships generalize to relationships with parents. Furthermore, the results indicate that the influence of parents decreases, whereas the influence of friends increases, and that both social worlds become equally important and overlapping towards late adolescence.