If you were to interview a user to obtain biographical information (age, education, years of experience on the job, and so forth) about the staff of 10 employees and you have only one hour to acquire the information. Which of the following methods would you use and why?

(i) Structured interviews using open-ended questions;

(ii) Unstructured interviews of five minutes each;

(iii) Self-administered questionnaires;

(iv) Structured interviews using closed questions.