The semi-structured interview is the most common form of interviewing. In it, the interviewer has worked out a set of questions beforehand, but intends the interview to be conversational. To do so, the interviewer can change the order of the questions or the way they are worded. He or she can give explanations or leave out questions that may appear redundant. So, the main job is to get the interviewer to talk freely and openly while making sure you get the in-depth information on what you are researching.
WEST LOTHIAN COUNCIL (2004): 8. Semi-structured interview. In: West Lothian Council Psychological Services, Research Guidelines. Livingston: West Lothian Council, pp.38-39. URL [Accessed: 30.06.2019]