The DiSCiPl Project: Debugging Systems for Constraint Programming. Constraint Programming is an Emerging Software Technology, where Europe currently enjoys a lead. Although Constraint Programming is relatively young compared to other languages, technologies and paradigms, it is already producing convincing results. To allow industry to benefit from this emerging technology, to take up results and to build applications capable of capturing and handling real world constraints, Constraint Programming needs a boost in the form of effective debugging techniques and environments adapted to its own paradigms. DiSCiPl is a research project funded by the European Commission’s Esprit programme that aims at define, implement and assess novel and effective debugging systems for Constraint Programming (CP).