The HyperTrac Project: Recent Progress and Future Research Directions on
  Hypergraph Decompositions
  Constraint Satisfaction Problems (CSPs) play a central role in many
applications in Artificial Intelligence and Operations Research. In general,
solving CSPs is NP-complete. The structure of CSPs is best described by
hypergraphs. Therefore, various forms of hypergraph decompositions have been
proposed in the literature to identify tractable fragments of CSPs. However,
also the computation of a concrete hypergraph decomposition is a challenging
task in itself. In this paper, we report on recent progress in the study of
hypergraph decompositions and we outline several directions for future
research.
