Dynamic input/output automata: A formal and compositional model for dynamic systems

Paul C. Attie, Nancy A. Lynch

Research output: Contribution to journalArticle

6 Scopus citations


We present dynamic I/O automata (DIOA), a compositional model of dynamic systems. In DIOA, automata can be created and destroyed dynamically, as computation proceeds, and an automaton can dynamically change its signature, i.e., the set of actions in which it can participate. DIOA features operators for parallel composition, action hiding, action renaming, a notion of automaton creation, and a notion of behavioral subtyping by means of trace inclusion. DIOA can model mobility, using signature modification, and is hierarchical: a dynamically changing system of interacting automata is itself modeled as a single automaton. We also show that parallel composition, action hiding, action renaming, and (subject to some technical conditions) automaton creation are all monotonic with respect to trace inclusion: if one component is replaced by another whose traces are a subset of the former, then the set of traces of the system as a whole can only be reduced.

Original languageEnglish (US)
Pages (from-to)28-75
Number of pages48
JournalInformation and Computation
Publication statusPublished - Aug 1 2016
Externally publishedYes



  • Automata
  • Dynamic systems
  • Formal methods
  • Mobility
  • Process creation
  • Semantics

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Information Systems
  • Computer Science Applications
  • Computational Theory and Mathematics

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