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Rigby et al. (2004), in their survey of original articles in three UK general practice journals, found that the most common design was that of a cross‐sectional or questionnaire survey, with approximately one third of the articles classified as such.

For all but the smallest data sets it is desirable to use a computer for statistical analysis. The responses to a questionnaire will need to be easily coded for computer analysis and a medical statistician may be able to help with this. It is important to ask for help at an early stage so that the questionnaire can be piloted and modified before use in a study. Further details on questionnaire design and surveys are given in Chapter 14.