What does it mean that the feedback loop has four parts?

Action observation evaluation and adjustment form the basic feedback cycle.

Example: You launch a new pricing page. You watch session recordings (observation). Bounce rate is 68% and nobody clicks the CTA (evaluation). You rewrite the headline and simplify the layout (adjustment). Bounce rate drops to 41%. The four parts ran in sequence — you just never named them before.

Try this: Pick one habit, project, or process you are actively running. Map it onto the four-part loop: What action are you taking? What are you observing about the results? How are you evaluating whether it is working? What adjustment have you made (or failed to make) based on that evaluation? If any quadrant is empty, you have found a broken loop.