A master service agreement (MSA) is a fundamental contract outlining the scope of the relationship between two parties. Firstly, an SOW should set the project's scope.Here, the extent of the work that will be done is defined. Learn the differences and similarities between a Master Service Agreement and a Statement of Work in this detailed analysis of MSA vs SOW. The SOW authorizes Agency to commence performing any Services as of the Effective Date. This Master Subscription Agreement (the "Agreement") sets forth the terms and conditions that govern access to and use of the Services (as defined below) MSA stands for Master Service Agreement, while SOW stands for Statement of Work. The idea is that you use one master agreement to establish the legal terms. Supplier Master Record. (c) Training Requirements.