A survey of 65 principals in the Newark (New Jersey) school system elicited their perceptions of the effectiveness of the Newark Teacher Center, in terms of its value to the principals themselves as well as to the teachers. The principals were asked to indicate the degree of agreement or disagreement on 22 items. The highest agreement was with the statement, "In my opinion the elimination of the Newark Teacher Center would be a loss to our district." Other items asked the principals to indicate which programs offered at the center were of value to them as instructional leaders and to identify positive changes they perceived in teachers' methods of instruction, classroom management, and other teaching skills. The majority of the principals agreed with the questionnaire items regarding the value of various types of activities to themselves. More principals in schools with a high rate of particpation in the Newark Teacher Center observed changes in teachers' methods of instruction, attitudes toward teaching, classroom management techniques, availability and use of resources, pupil achievement, and the sharing of ideas and materials than did principals in schools with a low rate of teacher participation. They felt that the Newark Teacher Center was successful in attracting less motivated teachers. Most of the differences in responses between the principals from schools with high, medium, and low participation rates were in the areas of teacher behaviors as opposed to activities of professional value to the principals. A copy of the questionnaire is attached to this report. (JD)