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A questionnaire is a research instrument that has questions that are standardized to collect responses from respondents. Responses to individual questions (items) on an organized questionnaire could be combined into a composite scale or index for statistical analysis. A variety of research types use questionnaires, such as academic research and market research.

It is important to consider the intended audience of your survey when designing it. The questions should be straightforward and easy to understand, without technical terms or jargon that are confusing for people who are not experts. The length of the survey must be kept to a minimum. Respondents do not like long surveys and the longer a survey is, the lower the response rate will be.

Web experiments are an online experimental method of research that utilizes web-based interfaces, such as websites or mobile applications. This method has numerous advantages, including the possibility of creating interactive and personalized tests, the possibility to track user activity and conditional branching depending on the answers previously given by participants.

The disadvantages of web experiments include the absence of a control group which could lead to unintentional confusion and poor generalization. Because of the interactive nature of web-based experiments, it can also be difficult to evaluate their results.

Lastly, it is important to pretest your questionnaire, at a minimum, using a convenient sample, prior to administering it in the field. This will allow you to spot any ambiguity or unclear words in the questions and eliminate them prior to distributing the survey to your intended audience.