The main objective of this book is to present some resources for research on the Educational Leadership Competence of managers who are performing their functions in different educational institutions. The scale elaborated by the authors to stimulate scientific research is presented. At the same time, procedures are presented to assess the competence of individual managers and that of groups of them as a whole. Instruments elaborated to capture the necessary information are also introduced. The Excel workbooks for calculating sample size (CaTaMu) and for applying proportional stratified sampling (MuEstProp) are also introduced, based on the selection of representative samples. In addition, the Excel book EsComDE is presented as a technological resource that allows the processing of such large numbers of data generated, so as to facilitate the presentation in tables and graphs. The essence of its use lies in its potential for the formulation of valid conclusions and reasonable decision-making. Real examples of good practices in its application are also presented.