Broad is a component of The Elevate Formula, which is Skill 5 of The 7 Skills to Impress and is discussed in Part 2, Chapter 5 of the book.
When it refers to SQAs, it means that they apply to a ‘Broad’ range of situations. This contributes to a High Score Identity.
When it refers to a problem, it means that the effects of that problem extend to numerous other areas of the person’s life, which adds to a Low Score Identity.
See also The Elevate Formula