Problem-solving and particularly the part that focuses on root cause analysis (RCA) has always been one of the topics that has had my special interest. Specifically, two questions always slumbered in my head, viz. (1) whether you could speak of one root cause, or that you should speak of multiple (root) causes; and (2) whether you should speak of the root cause or rather the root condition. This is the final post in a series of six posts, in which I have tried to explain how rigorous problem-solving logic (using an example) can help us answer these questions. At the same time, I hope the example and the logic will be useful in your own problem-solving efforts or your coaching thereof. This sixth and final post will summarize the analysis, say something about prioritizing counter-measures and conclude on the two questions. I will end the series with some words on how this can help you in your problem-solving efforts and your coaching of problem-solving teams.