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This is a technique which consists of opening up the subject with the respondent and allowing him to say what he knows, thinks or feels about it, at the same time assisting the process by asking searching questions.

In this method no set questionnaire is used and the interviewer is asked to find out whatever he can from the respondent about the subject being investigated. Normally the interviewer has a list of points covering the particular aspects of the subject in which the investigation is interested and this is done solely for the purpose of guiding him in his approach. Interviewing in depth really means probing the mind of the respondent until every scrap of relevant information has been elicited.

This type of interviewing cannot always be linked with a proper survey sample, because it will often be difficult to make a statistical analysis of the results. No set questionnaire is used and analysis by question is, therefore, impossible. Where depth interviewing is used, it is also generally unnecessary to interview a large number of people since it is qualitative data which is being sought and not quantitative data.

This research mind map displays the available means of gathering information on the Big Bang. It also shows the sequence in which the various techniques and methodologies were conducted.