Strengths:
Cost effective: they can provide large amounts of research data for relatively costs. Therefore, a large sample size can be obtained which should be representative of the population, which a researcher can then generalize from.
Standardized questions: all respondents are asked exactly the same question in the same order - the questionnaire can then be replicated to check for reliability. Therefore, a second researcher can use the questionnaire to check that the results are consistent.
Weaknesses:
Response bias: participants might tend to reply in a similar way (i.e. always ticking 'yes') in order to fill out the questionnaire quickly without properly reading the questions.
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