1.The main difference between self-completion and postal questionnaires is the mode of delivery to the respondents. The postal questionnaire is a type of self-completion questionnaires delivered to the respondents through the post. Moreover, the respondents send the filled surveys to the researcher through the post. As outlined in this chapter, with self-completion questionnaires, the respondents answer the questions by completing the questionnaires themselves. In this respect, a postal questionnaire is one out the different types of self-completing questionnaires that researchers utilize. However, it is differentiated from the self-completion ones based on the mode of delivery to the respondents.
2.The self-completion questionnaires are cheaper and quicker to administer than the structured interview. Moreover, they eliminate the interviewer effects present in the structured interview method. Unlike the structured interview, the self-completion questionnaires are convenient to the respondents as they are allowed to complete the questions at their desired pace. Unlike structured interviews, self –completion questionnaires have low response rates, lacks someone to guide the respondents in answering the questions and limits the ability of the respondents to elaborate on their response. Additionally, it is difficult to monitor if the right person answered questions in the case of self-completion questionnaires.
3.Self-completion questionnaires are mainly made of closed questions since they are easy to answer. With closed questions, the respondents cannot stray from the focus of the survey. The self-completion questionnaires are filled in the absence of the researchers. In this respect, the closed questions serve as a guide for restraining the respondents from deviating from the study focus. Furthermore, the closed questions limit the risk of respondents’ fatigue. The closed questions restrict the respondents from answering the questionnaires with long sentences with can cause exhaustion. The closed questions also serve to increase the response rate as they are easy to answer.