The Karolinska Psychodynamic Profile (KAPP) is a rating instrument based on psychoanalytical theory, that is intended to assess relatively stable modes of mental functioning, as they appear in self-perception and in interpersonal relations. The 18 subscales of the KAPP and their scale steps are described in detail and kept close to clinically observable phenomena. The information needed for assessment is obtained through a structural interview procedure. The interrater reliability was tested with different Swedish raters with varying psychodynamic training and experience. It was also tested with a non-Swedish rater with psychoanalytic training. The interrater correlations were generally high, suggesting that the KAPP has interdisciplinary and cross-cultural reliability.