An OD program begins with diagnosing the system and its processes to understand the current state. This involves analyzing the organization's subsystems and processes to identify problems and opportunities. The practitioner may focus on one subsystem at a time or the entire organization simultaneously. Information is collected and interventions are employed, such as planning, executing, and evaluating actions, to accomplish organizational improvement goals. The interventions have learning and educational goals, and usually involve formulating a three-year strategy plan. Action research principles are used to monitor and evaluate the interventions to ensure the intended consequences support the organization's goals.