Stengths: able to study large samples of people fairly easy and quickly. They are able to examine a large number of variables and can ask people to reveal behaviour and feelings which have been experienced in real situations.
Weaknesses: social desirability bias (can be a big problem with self report measures) as participants often answer in a way to portray themselves in a good light. Questions are not always clear so the respondant might not fully understand the question being asked. Response rate to questionnaires is usuall very low. Leading questions may be involved.
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