In this chapter, we discuss the interviewing of adult witnesses and victims with reference to how the extant psychological and linguistic literature has contributed to understanding and informing interview practice over the past 20 years and how it continues to support practical and procedural improvements. We have only scratched the surface of this important and complex topic, but throughout this chapter we have directed readers to many in-depth reviews and some of the most contemporary research literature currently available in this domain. We have introduced the PEACE model and described the Cognitive Interview procedure and its development. We have also discussed rapport building, question types and communication style, all with reference to witness memory and practical interviewing. Finally, we highlight areas that would benefit from research, for example conducting interviews with interpreters, and how new training initiatives are seeking to improve interview procedures and interviewer practice.