  This volume contains papers presented at WLPE 2005, 15th International
Workshop on Logic-based methods in Programming Environments.
  The aim of the workshop is to provide an informal meeting for the researchers
working on logic-based tools for development and analysis of programs. This
year we emphasized two aspects: on one hand the presentation, pragmatics and
experiences of tools for logic programming environments; on the other one,
logic-based environmental tools for programming in general.
  The workshop took place in Sitges (Barcelona), Spain as a satellite workshop
of the 21th International Conference on Logic Programming (ICLP 2005). This
workshop continues the series of successful international workshops on logic
programming environments held in Ohio, USA (1989), Eilat, Israel (1990), Paris,
France (1991), Washington, USA (1992), Vancouver, Canada (1993), Santa
Margherita Ligure, Italy (1994), Portland, USA (1995), Leuven, Belgium and Port
Jefferson, USA (1997), Las Cruces, USA (1999), Paphos, Cyprus (2001),
Copenhagen, Denmark (2002), Mumbai, India (2003) and Saint Malo, France (2004).
  We have received eight submissions (2 from France, 2 Spain-US cooperations,
one Spain-Argentina cooperation, one from Japan, one from the United Kingdom
and one Sweden-France cooperation). Program committee has decided to accept
seven papers. This volume contains revised versions of the accepted papers.
  We are grateful to the authors of the papers, the reviewers and the members
of the Program Committee for the help and fruitful discussions.
