Web-based questionnaires and experiments are essential epidemiologic tools that provide important information about public health and disease. They are a popular method of collecting data that is typically less expensive and time-consuming than face-to-face interviews, mailed questionnaires or automated telephone menu systems. However, questionnaires read more and Web tests have some limitations that must be addressed to ensure valid and reliable results.
A questionnaire could be influenced by response bias, which is the tendency of respondents to answer questions according to their own opinions, not the research goals. The design of a questionnaire can affect responses in a variety of ways. For instance, the wording of the question may affect whether respondents are able to comprehend the question and interpret it in the same way (reliable) as well as whether the question is relevant to the subject you are interested in (valid) and whether they are able to accurately answer (credible).
Respondents can also experience survey fatigue or lack of interest in the questions that are asked which reduces the chances of them providing honest answers. A lack of incentives or compensation can make it difficult for respondents to fill out an application.
Online questionnaires can also pose a challenge for certain experimental designs such as studies of reaction time or position. It is difficult to control and measure the same variables across people due to the different settings for browsers operating systems, settings, and sizes of screens.
Finaly, Web-based surveys can only be accessed by people who are keyboard and Internet proficient. This excludes a substantial portion of the population. Additionally, it is often difficult to Web researchers to explain the results of their research after an experiment’s window closes.