Eduworks proposes to develop a reference architecture (components, protocols, APIs, standards) for deploying intelligent tutoring systems (ITS) as services in training environments ranging from traditional LMS-centric environments to multi-component live, virtual, and constructive (LVC) environments that include games, simulations, and VR. We will start with a baseline service-oriented architecture (SOA) that incorporates the US Advanced Distributed Learning (ADL) initiatives Total Learning Architecture (TLA), the standard model of ITS, and existing reference architectures such as the Live Synthetic Training and Test & Evaluation Infrastructure Architecture (LS TTE IA). We will derive a comprehensive set of requirements from an environmental scan and from targeted use cases, and will modify the baseline architecture to meet these requirements, including requirements for team as well as individual training.The resulting reference architecture will guide the design, development, acquisition, evaluation, and governance of ITS offered as services in SOA training environments. Particular attention will be paid to pedagogical services and to collecting learner and other data required to evaluate training effectiveness and to manage SOA training environments within larger enterprise architectures. A proposed Phase I Option will prepare for the development of reference implementations in a Phase II project.