For large organizations including government departments and agencies, the selection of particular open source solutions or approaches often becomes side-tracked by uncertainties about whether the collaborative open source business model itself is "authorized" in the organization. Business architecture should set the context for IM/IT architecture. In October 2002, the Architecture and Engineering Committee (AECEnterprise Architecture PatternPWGSCUnified Modeling Language ) of the Canadian Federal Department of Public Works and Government Services () passed the following statement: "AEC agrees that the "open source business model" is one of the appropriate models for: (a) the selection and use of IM/IT solutions in PWGSC; (b) the production and sharing of IM/IT solutions by PWGSC." Work is now underway to refine the technical documentation of this business model as an http://hillside.net/chiliplop/2003/2003_enterprise_architectural_patterns.htm, and to document it using the business extensions of the open standard http://www.omg.org/uml/. This reference documentation will be shared under the GNU-FDL for others to use and adapt as required. This workshop discussion will be an early opportunity to orient this reference documentation to serve the enterprise architecture requirements of a wide diversity of organizations.