Aspect-oriented programming is an emerging paradigm in software engineering and programming languages that promises better support for separation of concerns. The second Foundations of Aspect-Oriented Languages (FOAL) workshop was held at the 2nd International Conference on Aspect-Oriented Software Development in Boston, Massachusetts, on March 17, 2003. This workshop was designed to be a forum for research in formal foundations of aspect-oriented programming languages. The call for papers announced the areas of interest for FOAL as including, but not limited to: semantics of aspect-oriented languages, specification and verification for such languages, type systems, static analysis, theory of testing, theory of aspect composition, theory of aspect translation (compilation) and rewriting, and applications of such theories in practice (such as language design studies). The call for papers welcomed all theoretical and foundational studies of this topic. The goals of this FOAL workshop were to: make progress on the foundations of aspect-oriented programming languages, exchange ideas about semantics and formal methods for aspect-oriented programming languages, foster interest in the programming language theory communities concerning aspects and aspect- oriented programming languages, and foster interest in the formal methods community concerning aspects and aspect-oriented programming. In addition, we hoped that the workshop would produce an outline of collaborative research topics and a list of areas for further exploration.