This study was an initial attempt to establish the concurrent validity of the Psychotherapy Problem Checklist (2, 3), a reliable (test-retest r = .81) self-report measure of clients' problem resolution, based on 21 items or symptoms (e.g., "Do you frequently have headaches?"; "Does your stomach often feel like it is tied up in knots?"; "Do you feel anxious a great deal of the time?") which are usually indicative of trait anxiety, as defined by Spielberger (4). Thus, the checklist can be used with typical, neurotic clients in psychotherapy to determine their general tendency toward anxiety as measured by the frequency with which they experience symptoms of anxiety. All ,items in the checklist are worded so as to exclude symptoms which are either of a mild variety or occur infrequently, ruling out the possibility of superficial change (temporary anxiety-state change) as a result of psychotherapeutic interventions. This measure has some considerable advantages over existing measures of anxiety in that it is not only brief, but easily understood by clients of limited intelligence because its symptomfocused wording of items is simple, and the format limited response (yes, no). To establish the validity of this instrument as a measure of trait anxiety, 70 clients (29 males, 41 females; mean age = 32.01 yr., range, 14 to 61 yr ; average of 14.04 yr. of formal education), who in a 12-mo. period elected to undergo emotive-reconstructive therapy (1)-an approach based on personal consuuct theory and using mental imagery techniques, were administered, before beginning psychotherapy, both the checklist as well as Spielberger's State-Trait Anxiety Inventory, A-Trait Scale (4), recognized as a valid measure of tendency toward anxiety. The Pearson product-moment correlation between the clients' scores on the checklist (M = 8.43, range 0 to 19)' and those on the inventory (M = 51.11, range 21 to 73) was .78 (69 df, p < .01), suggesting that the checklist measures, at least in part, the similar trait of anxiety measured by Spielberger's A-Trait Scale. If funher, planned tests of validity continue to strengthen the concurrent and predictive (2, 3) validity of the checklist, psychotherapists may find this symptom-focused, brief, and easily understood instrument a useful measure in research on process and outcome variables in psychotherapy, especially with clients of limited formal education.