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Nowadays, most of the researchers are of the view that if they easily get the answers to their questions in the questionnaire or if the questions used in their research are taken from some other research, there is little need to pre-test them. However, there are numerous problems in questions, which can be identifi ed only by pretesting the questions. Questionnaire testing is an iterative process, which requires the application of different subsets of testing methods. Only with the choice of different testing methods, it is possible to detect different kinds of problems. An adequate questionnaire evolution process, therefore, usually requires a well-balanced mix of various methods, which have to be applied at different stages of the development process. The result of each method improves specifi c aspects of the questionnaire. The aim of the recommendations presented in this paper is to give an introduction to widely accepted …