Many research questions are effectively answered by collecting data about the opinions, beliefs, and perceptions of large numbers of persons in widely dispersed areas. The questionnaire is an economical means of gathering such information. Properly designed questionnaires can collect valid and reliable data for analyzing a research problem. This article reviews fundamental principles of questionnaire design and presents a matrix to guide the construction of a questionnaire. Methods to avoid common problems and pitfalls in developing a questionnaire are also presented. Field testing is recommended to ensure validity and reliability.

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