This book is composed of two sections, one on "Theory and Clinical Institutionality" and the other on "Research in Institutional Analysis". The first part brings together seven chapters that combine concepts with descriptions and clinical conjectures. The topics addressed are diverse and include problems linked to the specific practice of the institutional analyst, his function, the objectives of this practice, as well as a set of criteria for thinking about organizational conflicts, the tendency to create fictions, splits and expulsions, institutional violence, etc. This section culminates with a text in homage to Pichon-Rivière. The second part of the book contains four chapters in which I present a set of systematic investigations on different institutional topics: evaluation of processes and results, analysis of demand and closure of an intervention, a study on the social representations of the profession in psychology students and, finally, a reworking of a text that we wrote about seven years ago with David Maldavsky. The latter is a comparative study of the discourse of two types of leaders: politicians (presidents) and religious (popes). In all the chapters of this second section we use a psychoanalytic method of discourse analysis, the David Liberman Algorithm (ADL) which was created by David Maldavsky.