Acquisition programs typically develop a set of system requirements early in their lifecycle, which then become the standard against which future designs are evaluated. It is critical that these requirements be set at appropriate levels. Requirement sets that are not simultaneously achievable are a relatively common problem in military acquisition programs and often are not recognized until significant investment has already been made – sometimes even leading to program cancellation. The Advanced Requirements Integration & Exploration System (ARIES) is designed to aid program stakeholders in understanding the requirements trade space for a system and facilitate the identification of an achievable set of requirements. This paper presents the ARIES methodology, describes the analytic capability, and discusses its application.