A survey is one of the most common methods in health sciences research.
As in this case, choosing a suitable study design depends on the research question, so
also survey research questions also decide methods. The decision of application of
scale of measurement depends on the nature of the observations, which could be
numerical, nominal, or ordinal. If research develops his/her new survey instrument
(survey questionnaire), its validity & reliability requires other important treatments.
This forms the subject of discussion in this chapter.