1. The phases of organizational development (OD) include recognition of the need for change, diagnosis of problems, planning for change, intervention in the system, and evaluation and feedback. 2. During the diagnosis phase, the real problem is defined and examined by identifying the problem, what must change to resolve it, and the expected objectives of the change. 3. The planning phase involves transforming the diagnosis into an action plan with overall goals and the best approach and timeline for achieving them.