Within the depth-psychology and clinical training corpus, Interpersonal Effectiveness emerges primarily as a structured, skill-based module native to Dialectical Behavior Therapy (DBT), though its conceptual roots extend into broader relational and group-psychotherapy traditions. Scott’s DBT Skills Training Manual (2021) provides the most systematic treatment, situating Interpersonal Effectiveness as one of four interlocking skill modules — alongside Core Mindfulness, Emotion Regulation, and Distress Tolerance — and subdividing it into objective effectiveness, relationship effectiveness, and self-respect effectiveness. The term thus carries a simultaneously behavioral and intrapsychic valence: it addresses not merely social competence but the preservation of self-regard within relational exchange. A secondary current in the corpus, visible through Yalom’s group-psychotherapy framework, treats interpersonal effectiveness less as an explicit instructional target and more as an emergent property of therapeutic process — the social microcosm of the group becoming the arena in which maladaptive interpersonal patterns are identified and corrected. Linehan’s influence runs through both streams: the insistence that emotional dysregulation and relational dysfunction are inseparable problems requiring parallel remediation. Tensions exist between the manualized, didactic DBT approach and the more experiential, insight-oriented group tradition. Harris’s ACT framework offers a third inflection, framing interpersonal goals as behavioral commitments grounded in values rather than technique-acquisition. Across all positions, assertiveness, boundary-setting, and emotion regulation appear as necessary co-conditions for genuine interpersonal effectiveness.