This document discusses organization development (OD) as a human capital function and provides an overview of OD management and comprehensive models. It presents a 5-organ model for achieving organizational effectiveness and describes OD interventions. An example case study is also mentioned. OD aims to improve organizational performance by collecting data, diagnosing issues, and designing interventions to increase synergy between strategy, structure, systems, human capital, and culture. The PDCA cycle is outlined as an OD management approach involving planning, doing, checking, and acting. Lastly, a comprehensive model is shown to diagnose organizations at the individual, group, and organizational levels.