• Interpersonal attraction and bonding emerge from disclosure practices, perceived similarity, and projection biases that shape judgments and the formation of closeness across contexts [10], [9], [16], [18], [1].

• Propinquity, opportunities for interaction, and contiguity shape relationship formation and maintenance, with classroom and everyday encounters predicting stronger ties and stable networks [6], [4], [17].

• Complementarity vs similarity mechanisms guide mate selection and friendships, where matching on needs and affective styles interacts with self-perception to influence attraction and relationship dynamics [5], [9], [20].

• Group affiliation strategies and reference-group dynamics affect adjustment, acceptance, and identity embedding within new groups, highlighting social-identity processes in interpersonal adaptation [8], [18], [19].

• Therapeutic and helping relationships exhibit core interpersonal features—empathy, self-other integration, and relationship quality factors—recurrent across clinical and counseling contexts [11], [15], [7].