Validity of questionnaire items

This book focuses on analyzing the validity of questionnaire items for evaluating supermarkets from the point of view of their customers. Twenty-four evaluation items related to supermarket services were selected to create a questionnaire which was answered by customers of the establishment studied evaluating each item as essential important but not essential or non-essential. Applying the Lawshe method it was possible to validate or exclude items from the questionnaire according to the perception of the respondents.