This unique text provides police officers with practical guidance on what to do prior to during & following investigative interviews of all kinds of witnesses from vulnerable adults & children to suspects. It explains the psychological underpinning of the Conversation Management technique which lies at the heart of the PEACE interviewing model. It offers a comprehensive tool-kit to help officers skillfully assess & monitor the interviewee & to capture the fine-grain detail of what is said or indeed not said in an interview. It advises officers on how to operate ethically & to maximum effect at each phase of interviewing. This highly accessible text contains a variety of useful features including checklists best practice & handy dialogue boxes providing how to guidance on interviewing vulnerable & non-vulnerable witnesses child witnesses & suspects. It is intended to complement the courses that police officers attend as part of their interview training including tiers 1-5 Vulnerable Witness Interviewing & PIP.