The document provides definitions and descriptions of organization development (OD) and related concepts. It defines OD as "an effort planned, organization-wide, and managed from the top, to increase organization effectiveness and health through planned interventions in the organization's 'processes,' using behavioral-science knowledge." It also discusses different types of OD interventions such as human process interventions focused on interpersonal relationships and group dynamics, and techno-structural interventions dealing with an organization's technology and structure. The document outlines the typical process of OD including diagnosis, intervention, and evaluation steps.