Practical considerations

Researchers must be clear of the primary outcome of the questionnaire (e.g. the dimension(s) and domains(s) of activity the questionnaire is designed to measure) and ensure this fits with the research question?
Additional demographic data should be collected to aid data analysis and interpretation
Is there likely to be a seasonal effect to physical activity in the population under study, and if so will this be captured?
What is the time frame for the questionnaire?
Has the instrument been tested for reliability?
Has appropriate validation been undertaken i.e. against a suitable objective measure?
Was the validation undertaken in a similar population? Is this population similar to the one you intend to study?
Is the questionnaire culturally specific?
How will the questionnaire be administered (face to face, by telephone, internet, via post, proxy or self-report)?
Clear completion and return instructions must be provided.
If questionnaires are to administered by an interviewer rigorous training must be done with all interviewers to ensure a standardised approach is taken.
Administration should follow a standard procedure and timescale.
How will data be cleaned, reduced and analysed?
What will constitute an outlier or an invalid recording?
What will be done with missing data, and if imputing data what will the basis of these decisions be?