Abstract
STAIRS is a formal approach to system development with UML 2.1 sequence diagrams that supports an incremental and modular development process. STAIRS is underpinned by denotational and operational semantics that have been proved to be equivalent. STAIRS is more expressive than most approaches with a formal notion of refinement. STAIRS supports a stepwise refinement process under which trace properties as well as trace-set properties are preserved. This paper demonstrates the potential of STAIRS in this respect, in particular that refinement in STAIRS preserves adherence to information flow properties as well as policies.
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