Comment by bjustin

> It says to gather missing information after gathering all known information but before defining a problem. How could you even know what information is missing, much less information that is important, without knowing the problem?

The post’s description of these steps is reasonable IMO. I’d write it as “put in order the relevant information you have” and “find the information which you know you need but don’t have at hand”.

By way of bad analogy, one could imagine writing up a document first off the top of your head, then filling in more of the document based on the documentation of the relevant systems, corresponding to these two steps the author describes.