Questionnaires and web experiments allow doctors to reach a much wider crowd than classic paper questionnaires, look here smartphone or face-to-face interviews and is conducted in a fraction of the cost. This makes them a trendy tool with respect to market research and customer online surveys as well as unconscious studies. However , inspite of their many advantages they come with some disadvantages which can challenge the validity of the results.
One serious problem is that presently there is much less control over data capture than with a paper questionnaire. With a Web experiment the participant is able to view stimuli on their own personal device and would also improve settings including screen size, browser, internet connection and even the standard font. What this means is that each respondent activities a subtly different questionnaire and this can affect how they answer questions.
Another problem is questionnaire taking exhaustion which can lead to respondents abandoning the study. The way to avoid this is to help make the questionnaire mainly because short as is possible and only ask questions that are tightly related to your research. You can even try to randomize the buy of the questions and pretest the questionnaire just before performing it to ensure that the questions are clear and understandable.
Finally, you will need to keep in mind that Web experiments depend on voluntary participation so they can be susceptible to motivational confounding than laboratory trials. To counter this, you can use an online marketplace including SONA systems (often employed for undergraduate evaluating at universities), MTurk or Productive to get participants.