The researcher observes, takes notes, talks to people, etc. All of these observation method of data collection pdf skills that need to be learned.
The same applies to carrying out interviews. Just the fact that we talk to people in our everyday life, listen, ask questions and communicate does not make us naturally a good interviewer. Technical competence, Interactive competence: attention and steering, competencies in communication theory and knowing how to deal with previous knowledge and personal bias.
Technical competence is needed in organizing interviews. You need to find participants, make arrangements for the interview, explain matters of confidentiality, prepare consent forms, make your interview participant feel comfortable, and find the right words to open the interview situation. Interactive competence refers to paying attention to your interview partner and steering the interview into the desired direction.