Aspects of the reliability and criterion-related validity of the patient version of the California Psychotherapy Alliance Scales (CALPAS-P) were examined. The sample consisted of 147 patients consulting in private practice. Ss completed the 24-item CALPAS-P designed to assess 4 alliance dimensions. They also filled out questionnaires on symptomatology, intimacy problems, social desirability, and satisfaction. Coefficients of internal consistency varied from .43 to .73 for the 4 scales and reached .83 for the total CALPAS-P. Correlations among CALPAS-P scales ranged from .37 to .62. Patients', therapists', and treatments' characteristics were not related to CALPAS-P scales. Selected CALPAS-P scales were related to symptomatology and intimacy problems, whereas all scales were associated with satisfaction in therapy. No association was found between CALPAS-P scales and estimates of social desirability. Confirmatory factor analysis would help support the theoretically based dimensionality of the CALPAS-P. (PsycINFO Database Record (c) 2012 APA, all rights reserved)