Writing good questions:
Avoid jargon (specialised language)
Avoid double-barrelled questions
Avoid leading questions
Closed questions:
Respondent has limited choices (eg a scale, a yes/no) - data produced tends to be quantitative
Strength = easier to analyse
Con produced graphs/charts for comparison => easier to draw conclusions
Limitation = responses are restricted
Forced into an answer, may not represent true feelings => reducing validity of findings
Open questions:
Respondent provides own answers expressed in words - data produced tends to be qualitative
Strength = responses not restricted
Answers more likely to provide detail, unexpected information => likely to have more external validity than statistics
Limitation = difficult to analyse
Wider variety of answers (than closed questions) - may be forced to reduce date to statistics