This report, the third in an IERC series on public school principals in Illinois, summarizes the results of a survey of 877 Illinois public school principals conducted by the IERC in November 2010. The purpose of the survey, and of this report, is to provide policymakers and the public with a better understanding of the important role principals play in leading teaching and learning and to identify strategies to support their continuous improvement. The report begins with a description of the survey methodology. Next, we present our findings regarding job satisfaction and work preferences, followed by an analysis of principals' priorities and their professional practices, with an emphasis on strategies for hiring and evaluating teachers. The report concludes with a summary of findings and a discussion of implications. Comparison of Respondents with Most Recent Population Data for Illinois Principals is appended. (Contains 25 figures, 2 tables and 8 footnotes.)