Data tends to be limited and superficial- questions need to be brief to increase the chances of people doing it and returning it
Things like incentives can add to the cost
Low Response Rate
Few who recieve questionnaires bother to complete and return them.
Inflexibility
Questionnaires are a very inflexible method. Once finalised, the researcher is stuck with the questions they have decided to ask and cannot explore new areas of interest should they come up during the research
