PDCA (Plan-Do-Check-Act) is a four-step management tool used to implement, manage, and drive continuous improvement. It is also a key part of lean manufacturing.
There are many ways to go about problem solving, especially in a business setting. But one method that has proven effective in manufacturing is the 5 Whys. It is a problem-solving tool that is used to dig deep and explore the cause-and-effect relationships underlying a problem. The goal is to identify the root cause of the problem, so you can resolve the issue rather than implementing a solution to a symptom or an effect.
Now that you have finished your basic fishbone diagram, your cross-functional team needs to be create a specific problem statement that everyone understands and can agree on in order to work toward a solution that will eliminate the root cause of the problem.