Ideally five ideas or less within a grouping
It is best to have five or less ideas within any grouping family. This helps your reader in two ways: they
- are less likely to get lost in lots of data
- will enjoy the synthesis that comes with organising your ideas into tight groups
It also helps you clarify your thinking by encouraging you to identify the links between your ideas and to put like with like, rigorously using the question and answer flow.
Only very occasionally will you need to have more than five ideas in a grouping. Some exceptions occur in the law and other technical fields where groups are prescribed by legislation or other industry accepted norms.