Although the previous description of the virtues of questionnaires might suggest that they are perfect research instruments, this is not quite so. Questionnaires have some serious limitations, and some of these have led certain researchers to claim that questionnaire data are not reliable or valid. I do not agree with this claim in general, but there is no doubt that it is very easy to produce unreliable and invalid data by means of ill-constructed questionnaires. In fact, as Gillham (2000, p. 1) points out, in research methodology "no single method has been so much abused." Let us look at the various problem sources.

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