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Since aspect-oriented programming is still in its infancy, little experience with employing this paradigm is currently available. In this paper, we start filling this gap by describing the aspects we used in Atlas, and by discussing the effect of aspects on our object-oriented development practices. We describe some rules and policies that we employed to achieve our goals of maintainability and modifiability, and introduce a straightforward notation to express the design of aspects. Although we faced some small hurdles along the way, this combination of technology helped us build a fast, well-structured system in a reasonable amount of time. Copyright 1999 by the Association for Computing Machinery.