Little scientific research has as yet been done on projects conforming to Enterprise Architecture. To lay foundations for such research, this paper presents a theoretical framework for defining the Project Architecture (PA) in the context of working with Enterprise Architecture. One part of the PA is the Project Start Architecture (PSA), which bounds the project to the Enterprise Architecture (EA) and/or Domain Architecture (DA). We start with explicating the context of a PSA in terms of its relation to the EA and DA. Subsequently, we define the PA in terms of three dimensions. The first dimension con-tains four aspect areas. The second dimension features four abstraction levels. The third dimension contains two project content categories: the PSA (containing prescriptions inherited from the EA and/or DA) and the PED (the Project Exclusive Design, containing the fundamental analysis and design artifacts that have been created specifically for the project). A real-life case is used to help illu-strate and validate the theoretical framework. Additionally, a mapping with RUP artifacts is made to further clarify the framework of the PA with examples of well-known analysis and design artifact types.

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