This paper describes by illustrative examples from therapeutic encounters the nine stages of an Intrapersonal Exploration (DX) scale. It is a revision of an earlier scale, based upon the theoretical conception of intrapersonal exploration as a sufficient antecedent condition for constructive personality change in psychotherapy. The scale is essentially an attempt to measure the extent to which the patient is engaged in self-exploration, with additional weightings given for personally private and personally damning material. In one study, six naive raters, using 358 samples of individual psychotherapy, yielded inter-rater reliabilities of between .58 and .78. This indicates to the author that the scale is explicit enough not to require 'background' or theoretical information for its use. Two other studies also yielded reasonably high inter-rater reliabilities. The scale ranges from zero (no demonstrable intrapersonal exploration) to nine (a very high level of self-probing and exploration). The judgments are based on the content of patient utterances. Test validity is not discussed. (Author/NG)