What is a phrase to indicate the action testing and correcting? For example, imagine a situation in which you don't know what you should do exactly and step by step you change things and see the results.
It's called trial and error.
Some related terms:
- cut and try - "marked by trial and error; cut–and–try methods, cut–and–try testing. First Known Use 1903."
- hill climbing - "...starts with an arbitrary solution to a problem, then attempts to find a better solution by incrementally changing [elements] of the solution. If the change produces a better solution, an incremental change is made to the new solution..." Note, gradient methods are related to hill climbing.
- kaizen, a continual1 improvement process, via a Plan - Do - Check - Act cycle, somewhat like using a series of small testing-and-correcting steps.
Note 1: wikipedia indicates continual is preferred to continuous here.