Findings from a study to develop and validate an instrument for the measurement of principals' attitudes toward visionary leadership are presented in this paper. Two leadership styles--visionary and managerial--were measured by a 35-item five-point Likert attitude scale. Questionnaires mailed to a random sample of 250 K-12 Nebraska and 250 California principals yielded 387 completions, a 77 percent response rate. Factor analysis confirmed that factors corresponding to the two leadership styles were implicit in the instrument design and supported the instrument's validity for measuring attitudes toward the conceptualization of visionary leadership. The instrument may be used for empirical substantiation of a generalization of visionary leadership style, for diagnostic purposes, and as a screening tool. Two tables, including a statistical analysis of the survey item results are provided. (11 references) (LMI)