A questionnaire is an instrument for research that contains questions that are in an established format to collect the responses of the respondents. The responses to each question (item) on a structured survey can be consolidated and analyzed statistically. Questionnaires are used in many kinds of research, like market research and scholarly studies.

It is crucial to think about the intended target audience when designing it. The questions should be straightforward and easy to comprehend, without jargon or technical terms that are difficult for non-experts. It is also important to keep the length of the survey to a minimum. The longer the survey the more likely respondents will respond.

Web experiments are the method of conducting online research by using a browser-based interface like a web page or mobile app. The advantages of this approach include the ability to create personal and interactive experiments, the capability to monitor user activity and the ability to use conditional branching based on previous answers given by the participant.

Web experiments aren’t controlled, and this could lead to confusion or poor generalization. Due to the nature of interaction of web experiments, it can also be difficult to analyze their results.

It is also important to pretest your questionnaire, at a minimum, using a convenient sample before administering it in the field. This will enable you to identify ambiguity, unclear wording or biases in the questions, and eliminate them before giving the questionnaire to your target population.

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