FOI only provides a right of access to information which has been recorded by an authority. For information to be recorded, it must be stored and held in some way - e.g. in a report, spreadsheet, email, or a minute from a meeting.
Bear this in mind when wording your request, and try to ask for information which is likely to already be recorded and held. You should avoid asking for an employee's opinion or view on an issue, as this is often unlikely to be recorded.
For example, don't ask: "What were you thinking when you took the decision to shut the Scotstown school playground?"
Instead, you could try: "Please send me information from all reports, correspondence or communications about the decision to shut the Scotstown school playground."