The numbering of the challenges (eg T1001) is a little confusing to me too. My assumption is that the first number after the T is a tactic ID and the remaining

The numbering of the challenges (eg T1001) is a little confusing to me too. My assumption is that the first number after the T is a tactic ID and the remaining digits are the challenge/issue ID. Maybe the challenge/issue ID is 3 digits because there's room (a plan?) to add many more examples? I like the substance of this conceptual model as well (and may actually use some of it in my own personal productivity framework :-)), but don't see why it needs to be presented this way. It's neat, but I'd personally rather all the content be on one page, and maybe with a search feature for if/when the list of example challenges/issues grows.