The Minnesota Teacher Attitude Inventory (MTAI) consists of 150 items in its original form. For practical and economical reasons, seven shorter versions formed from the 150 items and based on previous studies were tested on their validity and discrimination value. Responses of 90 teacher trainees, who in 1982 were enrolled at the Institute of Education in Singapore, were rescored according to the items in the shorter forms. Statistical analyses show that scores on the shorter forms correlated highly with those on the original form and all the other shorter forms. Moreover, most of the shorter forms differentiated the teacher trainees with respect to their teaching practice performance. As such, shorter versions with well-selected items could be recommended for future application. Two data tables and a list of the 150 items selected for the shorter forms of the MTAI are included. (Author/SLD)