JaCoP provides a library of set constraints in library org.jacop.set. This implementation is based on set intervals and related operations as originally presented in [5] and the first version has been implemented as a diploma project1 . JaCoP definition of set intervals, set domains and set variables is presented in section 4.1. Available constraints are discussed in section 4.2. Search, using set variables, is introduced in section 4.3.