This volume contains the papers presented at CP 2009: The 15th International Conference on
Principles and Practice of Constraint Programming. It was held from September 20-24 2009 at
the Rectory of the New University of Lisbon Portugal. Everyone involved with the conference
thanks our sponsors for their support. There were 128 submissions to the research track of
which 53 were accepted for a rate of 41.4%. Each submission was reviewed by three reviewers
with a small number of additional reviews obtained in exceptional cases. Each review
waseitherbyaProgrammeCommitteemember orbyacolleagueinvitedtohelp by a committee member thanks
to their particular expertise. Papers submitted as long papers were accepted at full length or
not at all. It is important to note that papers submitted as short papers were held to the same
high standards of qualityas long papers. There is thus no distinction in these proceedings
between long and short papers except of course the number of pages they occupy. As it happens
the acceptancerates of short and long papers wereverysimilar indeed.
Therewere13submissionstotheapplicationtrack ofwhich8wereaccepted fora
rateof61.5%.Papersunderwentthe samereviewprocessasregularpapers and there was not a separate
committee for reviewing application track papers. However papers in the application track were
not required to be original or novel research but to be original and novel as an application
of constraints.
