The Therapist Evaluation Inventory: evidence for an unidimensional scale.

The internal structure of the Therapist Evaluation Inventory (TEI) was investigated with data gathered from therapy sessions conducted by 16 individual psychotherapists with 292 psychiatrically disturbed adolescent inpatients. A principal components analysis (Varimax rotation) indicated a single dimension that accounted for 70.39% of scale variance. The findings did not corroborate a factor structure consistent with the a priori scales of the TEI.