Pattern Languages of Programs is the name of a group of annual conferences sponsored by The Hillside Group. The purpose of these conferences is to develop and refine the art of software design patterns. Most of the effort focuses on developing a textual presentation of a pattern such that it becomes easy to understand and apply. This is typically done in a writers' workshop setting.
The flagship conference is called the Pattern Languages of Programs conference, abbreviated as PLoP. PLoP has been held in the U.S.A. since 1994. Until 2004 it was held annually at Allerton Park in Monticello, Illinois, a property of the University of Illinois at Urbana Champaign. Since then, its location has alternated between Allerton park and being co-located with OOPSLA, a large computer science conference and the Agile Conference in 2009. The 20th PLoP will be back at Allerton Park.
PLoP (and several other Pattern Languages of Programs conferences) are sponsored by the The Hillside Group, a U.S.-based non-profit organization that holds the PLoP trademark and the rights to the conference.
The conference proceedings are typically published locally as technical reports of a sponsoring university. From 1998 to 2007, EuroPLoP papers were published annually by the German publisher Universitätsverlag Konstanz. After the conference, authors are given the chance to submit a revised paper for publication in the book series Pattern Languages of Program Design by Addison Wesley.
In 2007, an academic journal was started, called Transactions on Pattern Languages of Programming. The editors-in-chief are James Noble and Ralph Johnson and the European editor is Uwe Zdun. The journal is published by Springer-Verlag.