Portland Pattern Repository
American software design pattern repository
The Portland Pattern Repository (PPR) is an online repository for computer programming software design patterns. It was accompanied by the website WikiWikiWeb, the world's first wiki. The repository has an emphasis on extreme programming, and is hosted by Cunningham & Cunningham (C2) of Portland, Oregon. The PPR's motto is "People, Projects & Patterns".
History
On 17 September 1987, programmer Ward Cunningham with Tektronix and Apple Computer's Kent Beck co-published the paper "Using Pattern Languages for Object-Oriented Programs" This paper, about software design patterns, was inspired by Christopher Alexander's architectural concept of "patterns" It was written for the 1987 OOPSLA programming conference organized by the Association for Computing Machinery. Cunningham and Beck's idea became popular among programmers because it helped them exchange programming ideas in an easy to understand format.
Cunningham & Cunningham, the programming consultancy that would eventually host the PPR on its Internet domain, was incorporated in Salem, Oregon, on 1 November 1991, and is named after Ward and his wife, Karen R. Cunningham, a mathematician, school teacher, and school director. Cunningham & Cunningham registered their Internet domain, c2.com, on 23 October 1994. Ward created the Portland Pattern Repository on c2.com as a means to help object-oriented programmers publish their computer programming patterns by submitting them to him. Some of those programmers attended the OOPSLA and PLoP conferences about object-oriented programming, and posted their ideas on the PPR. The PPR is accompanied, on c2.com, by the first ever wiki, a collection of reader-modifiable Web pages, which is named WikiWikiWeb.
Begin with the source’s own compact description: “Portland Pattern Repository” is american software design pattern repository. The dossier treats that line as a proposition to test through Portland, Pattern and Repository, not as a finished interpretation.
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The phrase “american software design pattern repository” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Aug 10, 2025. The linked authority identifier is Q1637453. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1987, 1991 and 1994.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Portland Pattern Repository” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.