The psychometric properties and the factor structure of an extended and modified version of the German Test Anxiety Inventory TAI-G (Hodapp, 1991) were investigated in a sample of N = 91 university students attending pedagogical courses of studies. The four subscales "emotionality", "worry", "lack of confidence" and "interference" showed high internal consistencies and satisfied the criterion of Rasch scalability. The factor structure of the questionnaire could be replicated. A number of significant relationships of the four scales to important test anxiety variables could be established in the theoretically expected direction, substantiating the validity of the scales. The use of the TAI-G for a differentiated diagnosis of four subcomponents of test anxiety can be recommended on the basis of the results of the present investigation.