Sociometry was developed by Jacobo Levy Moreno, who thought of it as a way of systematizing and objectifying the study of what he called microsociology, which covered the study of the subject within the group, the group as a living and dynamic entity, and the institution or community as a container of different types of groups. This book is made up of two parts; the first refers to the historical, epistemological, methodological and technical foundations of the sociometric method, while the second presents different research protocols in which sociometry has been applied; from the form for the study of communities and collectivities, sociometry in educational contexts, the way to study high-performance groups, sociometry of family groups, among others.