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Software quality is the degree to which software possesses a desired combination of attributes (e.g., reliability, interoperability). In this paper we describe a few principles for analyzing a software architecture to determine if it exhibits certain quality attributes. We show how analysis techniques indigenous to the various quality attribute communities can provide a foundation for performing software architecture evaluation. We also show how the principles provide a context for existing evaluation approaches such as scenarios, questionnaires, checklists, and measurements. Our immediate goal in identifying these principles for attribute-based architecture evaluation is to better integrate existing techniques and metrics into software architecture practice, not necessarily to invent new attribute-specific techniques and metrics. A longer-term goal is to codify these principles into systematic procedures or methods for architecture evaluation. This paper is an initial step towards identifying the ingredients of such methods.