I actually received this advice (Word doc) as a handout in my nonfiction workshop last week and hoped that it would be available online to share with youse, and voila. Obviously many of these tips are useful for people working on long deadlines or doing deep investigation ("check clips, resumes, biographies, various writings and home addresses (map the address on a locator program just to get a feel for it). Look at court records, bankruptcy files, association memberships, etc. Question friends, family, neighbors and associates. If you are going to talk to a person about a machine, read the operating manual ahead of time.") However it's great interviewing advice for interviewers of all skill levels.