Personality functioning occupies a contested but strategically important position across the depth-psychological corpus. In empirical psychodynamic research — most prominently in Leichsenring’s 2008 meta-analysis and de Maat’s 2009 systematic review — the term operates as a discrete outcome domain alongside symptom severity, target problems, and social functioning, serving as the measure most sensitive to structural characterological change. Leichsenring’s data demonstrate that long-term psychodynamic psychotherapy (LTPP) produces large effect sizes for personality functioning specifically in personality-disorder populations, and that LTPP is significantly superior to shorter-term methods on this dimension — a finding with far-reaching clinical implications. The term thus indexes something beyond symptom remission: durable reorganization of character structure. In Jungian typological discourse, personality functioning is recast in terms of differentiation of the four functions and the hierarchy of dominant, auxiliary, tertiary, and inferior processes; von Franz, Hillman, Thomson, and Quenk each explore how the relative development or suppression of these functions determines the coherence, flexibility, and pathological vulnerability of the personality. Hillman’s archetypal psychology dissents from developmental and typological frameworks alike, arguing that personality is better understood through the multiplicity of ‘partial’ personalities — complexes, daimones — rather than through stages or functioning schemas. The term thus spans quantitative outcome research and qualitative depth inquiry, with the shared conviction that the personality is not a static given but a dynamic, improvable, or deteriorable configuration.