Increasingly, evaluations of pretesting methods have focused on the side-by-side comparison of techniques, in order to determine the degree to which the results obtained through use of these techniques agree, even if they cannot be directly validated. However, this research is complex, as evaluation in practice must take into account the multi-faceted nature of each of the pretesting techniques, and of questionnaire design in general (see Willis, DeMaio, and Harris-Kojetin, 1999). Although two studies (Presser and Blair, 1994; Willis, 2005) have specifically compared the results of cognitive interviewing, expert evaluation, and behavior coding, when these have been applied to the same questionnaire, this research has generally not been conducted in a way that allows for the separation of the effects of pretesting method from those of the organization applying these methods.Evaluation of methods for pretesting are focused to compare side by side to determine the results achieved through the use of these techniques, see even if they are not able to check directly. However, this research is complex, such as the practical assessment, to take into account the nature of each technique. Pretesting the questionnaire design, and General (see Villa Martelli sat DeMaio and Harris Kojetin, 1999), although the two studies (Presser and Blair in 1994, Wilkins, 2005) compared the effects of specific cognitive interview expert assessment, and the behavior when these are applied to the same query, this research has generally not been implemented in a way that allows the separation of the impact of how organisations from among the pretesting used these methods.
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