Controlling is the process of measuring performance, comparing it to standards, and taking corrective action. It has four key steps: 1) establish objectives and standards, 2) measure actual performance, 3) compare results to objectives and standards, 4) take corrective action as needed. Management by Objectives (MBO) is a structured process where supervisors and workers jointly set performance objectives, plans to achieve them, and standards to measure achievement. They then jointly review results and renew the process. MBO focuses effort on important tasks and builds relationships.