It is a set of related ideas that can be described under the same heading.
It is useful when your reader wants the course of action first, before the argument.
Inductive reasoning can be useful but it is harder to do as it is more creative.
It is less useful if you are presenting arguments but very useful for sections that require you to gather data and research findings from which to draw a conclusion.
You have to find a link among several pieces of information which is not more than seven.
To test your grouping, try giving it a plural noun or phrasal description.