This document outlines the diagnostic process in organization development. It discusses gathering data through methods like surveys, interviews, and observations. Key steps in diagnosis include identifying problems, collecting and analyzing data, identifying problem areas, and determining if the client is motivated to address issues. Diagnostic models can help analyze structures, cultures, and behaviors, such as the analytical, emergent group behavior, sociotechnical systems, and force-field models. The goal of diagnosis is to understand the current state of an organization and provide a basis for selecting change strategies.