this book constitutes the refereed proceedings of the 7th international conference on principles and practice of constraint programming, cp 2001, held in paphos, cyprus, in november/december 2001.the 37 revised full papers, 9 innovative applications presentations, and 14 short papers presented were carefully reviewed and selected from a total of 135 submissions. all current issues in constraint processing are addressed, ranging from theoretical and foundational issues to advanced and innovative applications in a variety of fields.