Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 6 - No. 40)
When designing a questionnaire, you must make sure that the choices you give are:
Many and overlapping.
Few and irrelevant.
Neither too few nor too many.
Easy and simple.
Spiegazione
You need to make sure that if you give a choice of answers, there are not too few or too many.