The "Three Step Interview" is also known as the "Reid Interview." The three steps are as follows:
1) Be prepared. A good interrogator will be intimately familiar with the background of the case. This means conducting a thorough case review prior to the interrogation and having a strategy with team members as the interview progresses.
2) Open Questions. Ask the person being interviewed open-ended questions, that is, questions that require more than a "yes" or "no" answer.
3) Active Listening. By far, your greatest tool might be your ability to listen well. Take in all the nuances of the conversation, pay attention to the question being answered, not the "next" one on your list of inquiries.