From my first Stompernet faculty office hour where I covered the Theory of Constraints Thinking Process tool called the Cloud or the Evaporating Cloud.  The cloud is used to understand the root cause of undesirable effects and/or conflicts.

While the cloud is part of the complete Theory of Constraints Thinking Processes, it is also a very useful stand alone tool.  You can use this quick reference guide to get you started.

Here is the one page overview I created for quick reference:  https://www.scienceofbusiness.com/Evaporating-Cloud-1-Page-Summary.pdf

If you want a book on the subject, here’s a couple that I recommend:
Thinking for a Change by Lisa J. Scheinkopf.
The Logical Thinking Process by H. William Dettmer (Bill Dettmer)

And in this one, Dr Goldratt talks about how to think and why clear thinking is so important:
The Choice by Eliyahu M Goldratt  (it’s a novel)

Here’s the video: