Divide and Conquer: the Quest for Compositional Design and Analysis

Summary

Compositionality is a key concept in computer science: only by breaking down a large system into smaller pieces, we can build today's complex software and hardware systems. The same holds true for verification and analysis: realistic systems can only be analyzed by chopping them up into smaller parts. Thus, compositionality has been widely studied in various different settings, and by different communities: people in programming languages, software verification, and model checking have all come up with their own techniques and solutions.

Thus, the goal of this workshop has been to bring together these fields and communities, so that they can learn from and cross-fertilize each other. We have succeeded in doing so: through three extensive tutorials, longer and shorter presentations, and working sessions, researchers from different areas have learned about each others problems, techniques, and approaches.

The scientific programme was built around four corners stones

1. Personal introductions.
2. Three well-received tutorials:
   • Compositional programming by Oscar Nierstrasz
   • Compositional verification by Arnd Poetzsch-Heffter
   • Compositional modelling by Arend Rensink
3. Regular presentations, presenting in-depth technical knowlegde on:
   • Verification of programming languages
   • Automatic synthesis
   • Interface theories
   • Model checking
   • Contract-based design
   • Software product lines
4. Working group sessions:
   • Working group on software product lines
   • Working group on Benchmark for Industrial Verification/Synthesis Problems
   • Working group on Modular Full Functional Specification and Verification of C and Java programs that Perform I/O
   • Model checking vd deducutive verification
   • Compositional Synthesis of Reactive Systems