Answer:
Case study
Explanation:
A Case Study is a non Experiemental and Qualitative research method. It is an in-depth and detailed study of ones case that involves a lot of information collection about a person, group, or event. The technique is used where one individual or a small group of people, places, things and others, are studied over a long period of time.
It is conducted in the form of Interviews, Psychological tests, observations and experiments. It can also be from people who were involved such as family/friends and information collected is analyzed to get the a full picture or deeper view.