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Web-based questionnaires and questionnaires are a vital epidemiologic technique that provides crucial information about the state of public health and illness. They are a typical method to collect data that is usually less expensive and time-consuming than face-to-face interviews, mailed questionnaires or automated menus for phones systems. However questionnaires, surveys and Web tests have some limitations that need to be addressed in order to ensure valid and reliable results.
A questionnaire may be influenced by response bias, the tendency of respondents to answer questions based on their own opinions, not the research objectives. Additionally, questionnaire design can influence responses in different ways. For example the wording of the question can affect whether respondents comprehend and interpret the questions in the same way (reliable) to determine the subject matter you’re interested in (valid), or can answer with accuracy (credible).
Survey fatigue or a lack involvement with the questions may cause respondents to be less likely to give honest responses. Lack of incentives or compensation can hinder respondents from filling out survey forms.
Online questionnaires also pose challenges for some experimental designs for example, positioning or reaction time studies. It is difficult to control and measure variables across participants because of the differences in browser settings as well as operating systems and screen sizes.
Additionally, surveys conducted on the Web are only accessible to people who have keyboards and are Internet literate, which currently excludes a significant percentage of the population. In addition, it’s usually difficult for Web researchers to debrief participants when the window for an experiment has closed.
