While various studies have related susceptibility to the Mueller-Lyer illusion to mental health, to developmental maturity, and to self-differentiation, there have been no studies in which susceptibility to the illusion has been related to a wide spectrum of self-concept dimensions. It is one of the purposes of the present study to analyze susceptibility to the Mueller-Lyer illusion as a function of errors in self-perception. To the extent that an individual suffers conflicts with regard to his self-concept, in any of its significant dimensions, it is expected that he will suffer a greater susceptibility to the illusion.

The present study was made to determine the relationship between the level of teaching effectiveness of beginning elementary teachers and three individual characteristics of prospective teachers. A secondary purpose was an attempt to improve the service rendered by the School of Education at North Texas State College, Denton, Texas, in the selection and guidance of students who indicate a desire to enter the program for preparing elementary teachers.

The problem of this study concerned the difference in relationships between major teaching behaving styles and dominant personality interests expressed in values.

The basic purpose of the study was to investigate the relationship of secondary school student teachers' manifest psychological needs and the accuracy of interpersonal perception and the self-concepts of students. In seeking a solution to the problem, the following subproblems were investigated: 1. The relationship of student teacher manifest psychological needs and the accuracy with which the student teacher perceived the attitudes of his students. 2. The relationship of the accuracy with which the student teacher perceived the attitudes of his students and the favorability of the students' attitudes toward the student teacher.

This was a study of the relationship of situational anxiety to vocal solo performances of college freshmen voice students.