Which of the following is not a type of interview based on structuredness?

The correct answer is semi-structured.

In the context of interviewing techniques, "structured" interviews have a predetermined format with a specific set of questions asked in the same order to every candidate, ensuring consistency and comparability of responses. "Unstructured" interviews are more conversational and flexible, allowing the interviewer to ask different questions based on the flow of the discussion. "Depth" interviews, often considered a form of qualitative research, delve deeply into a candidate's thoughts, experiences, and motivations with a more open format.

Semi-structured interviews, on the other hand, combine elements of both structured and unstructured interviews. They include a mix of predefined questions and the flexibility to explore topics in more depth depending on the candidate’s responses. Therefore, it is a type of interview that features structured elements, rather than being a distinct category that is "not a type" of interview based on structuredness. Semi-structured interviews also allow for adapting during the course of the interview, making them versatile for deeper insights while still retaining some structure in the questioning approach.