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It is recognized that a mail questionnaire has inherent limitations.

There is the danger that the questions will mean different things to different respondents.

Simple `` yes '' or `` no '' answers do not reveal the different shades of opinion that the various respondents may have.

A respondent may want to make alternative answers because he does not know the precise circumstances assumed in the question.

There is also the problem of the respondent's frame of reference.

Is the respondent making a recommendation for his own benefit, for the benefit of his industry, for the benefit of a specific government department or service, for the benefit of the defense program, for the benefit of small business, or for the benefit of the taxpayers??