Contractor must promptly update its EDS(s) on file with the City whenever any information or response provided in the EDS(s) is no longer complete and accurate. The CPO-GS may successfully negotiate State of Illinois master contracts with these awarded vendors, which result in multiple cooperative master contracts.An MSA, or Master Service Agreement, is a contract between a company and a vendor that outlines the terms and conditions for services the vendor will provide. The IGEA Agreement may incorporate one or more Chicago. Park District facilities from the list of sites contained in Exhibit A of the RFP. 2. Illinois Department of Central Management Services Personnel Labor Relations. What is a Master Agreement? A master agreement is a document that outlines the terms and conditions of an agreement between two or more parties. A master agreement may be used in situations in which a sponsor expects to fund multiple research projects with Northwestern over a period of time.