Life cycle validation, verification, and testing (VV&T) is extremely important for the success of a simulation study. Current software VV&T techniques and current simulation model VV&T techniques are challenged and describe how they can all be applied throughout the life cycle of a simulation study. The processes and credibility assessment stages of the life cycle are described and the applicability of the VV&T techniques for each stage is stated. A glossary is provided to explicitly define important terms and VV&T techniques.