> Appreciation

. . . is a very simple but powerful technique for extracting the maximum amount of information from a simple fact. 

> Drill Down

. . . is a simple technique for breaking complex problems down into progressively smaller parts.

> Fishbone

. . . or 'cause & effect' diagrams help you to think through causes of a problem thoroughly. Their major benefit is that they push you to consider all possible causes of the problem, rather than just the ones that are most obvious.