Domain engineering is perhaps the most promising method for requirement reuse. However, most of the methods proposed are too generic and lack practical guidelines to be used in information systems development. An information system distinguishes itself from other software as it is developed to facilitate the operation of an organization, hence it reflects its strategies, plans, organizations, processes, marketing etc. We believe that domain knowledge involved in information system development, which may include industry specific knowledge and generic enterprise management knowledge, can be organized and modeled in Enterprise Architecture.