In this matter, if you do not specify that the Respondent must choose only one answer, he may choose two or three alternatives. In fact the employee may draw on the firm and a high salary, and various benefits, and the prestige of the profession. As often happens in reality. But here the sociologist is interested in the priority of an alternative with a limited choice. Agree that the other option when you can choose two, three or an unlimited number of answers distribution of answers to alternatives may be very different or at least more or less different from the first. And so it happened with a control measurements in one experiment. Respondents were asked in three different questionnaires of the same content of the question, but in the first they were asked to choose only one answer, the second not more than two, and the third any number. (The object of study was the same study was carried out in parallel).
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