This book presents the method developed by Dr. Silvia Helena Koller and her students and collaborators to apply Urie Bronfenbrenners Bioecological Theory of Human Development to empirical studies with children and adolescents. Although Bronfenbrenner's theory, in different stages of development, has been widely cited by several researchers, surprisingly little has been written about the theory itself, its evolution or about the methods that should be used to test it. This book fills this gap by presenting both an overview of Bronfenbrenners theory and a method to apply it to empirical research, the Ecological Engagement method. The book also shows how this method can be applied in practice by bringing together a series of research reports of studies carried out in different regions of Brazil and in Angola that used the Ecological Engagement method to study children and adolescent development in different contexts, such as street situation, sexual exploitation, institutional reception, family reintegration, school and emergency and disasters, among others. Ecological Engagement Urie Bronfenbrenners Method to Study Human Development will be a valuable tool for psychologists and other social scientists interested in child and adolescent development looking for a solid an innovative methodology that allows researchers to directly interact with their research subjects in their own social contexts in order to fully understand their problems and issues. The methodology of Ecological Engagement, that is explained and richly empirically illustrated in this book, is a singularly significant extension of [Urie Bronfenbrenners] bioecological model. Indeed, in my view it is a brilliant empirical instantiation of the PPCT component of the model. () Ecological Engagement methodology is the scientific means through which Uries legacy can be furthered. Excerpt from the Foreword to the International Edition by Dr. Richard M. Lerner, director of the Institute for Applied Research in Youth Development, Tufts University.