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  • AsianPLoP


    Asian Conference on Pattern Languages of Programs (PLoP) conference is a premier event for pattern authors and users to gather, discuss and learn more about patterns and software development in the Asia region as well as other regions. The purpose of AsianPLoP is to promote development of patterns, pattern languages, technologies and experiences of patterns primarily about software; however, these for domains outside of software are also welcome.Visit the Asian PLoP Official Site   Read More
  • EuroPLoP


    EuroPLoP is the premier European conference on patterns and pattern languages. EuroPLoP 2017 will be held again at Kloster Irsee, Bavaria, Germany. At this fantastic venue you will experience a creative and constructive atmosphere that inspires your work. Visit the EuroPLoP Official Site. Read the full story Read More
  • ScrumPLoP


    ScrumPLoP is a PLoP® conference. It will be a gathering of experienced Scrum practitioners, assembled with the goal of contributing to the body of pattern literature with proven practices. If you don't yet know what a PLoP conference is, read about what a PLoP is here. Visit the ScrumPLoP Official Site. Read More
  • Viking PLoP

    Viking PLoP

    VikingPLoP contains writer’s workshops for submitted pattern papers, focus groups, and other activities. The conference provides participants with the opportunity to share their experience about patterns and software. As with the PLoP series of conferences, our overall goal is to build a community of patterns' people. VikingPLoP especially encourages submissions related to embedded systems, however, also other pattern-related topics are very welcome. Read More
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Pattern Books

The Design Patterns Book Series showcases many patterns from PLoP conferences and leading experts in the patterns field.

See our Pattern Book Library filled with over 80 Pattern related books.

Patterns Resources

PLoP Conference News

Christopher Alexander inspired Kent Beck and Ward Cunningham to write their first small pattern language in 1987 for designing user interfaces. In 1993, Kent Beck and Grady Booch sponsored a mountain retreat in Colorado which was the start of the nonprofit Hillside Group. The original vision of this group was to help uplift the software community through pattern writing. Toward this end, the Hillside Group started the Pattern Languages of Programming (PLoP) conference series; variations are now being held around the globe. PLoP conferences follow a highly collaborative style based on “shepherding” before submission and peer based feedback workshops during the conference. Many successful pattern papers and books have emerged from this process.

In 1994, Erich Gamma and his colleagues known as the Gang of Four (GoF) published "Design Patterns: Elements of Reusable Object-Oriented Software" which launched the concept of patterns to a broader audience. It is interesting to note that in a discipline that is known to experience continual change, these principles are still useful and this book continues to sell more than 20 years after publication. This success of patterns within the software community led to a lot of early hype about patterns.

As noted, patterns in software engineering draw inspiration from Christopher Alexander, who is recognized as an important building and urban planning architect (Salingaros, 2000). Alexander used patterns to document successful design practices in the architecture profession. His focus on proven solutions rather than new and unique ones was motivated by his observation that modern day buildings and towns do not approach the beauty of the historical past. He notes that the vast majority of architecture since the end of World War II has been dehumanizing, of poor quality, and lacking all sense of beauty and human feeling (O’Callaghan, 2001). This created his distaste for simply fashionable architecture and a preoccupation with the search for a design approach that generates beautiful structures (Grabow, 1983).

Patterns are generally defined as a three part construct. First comes the 'context'; under what conditions does this pattern hold. Next are a 'system of forces'. In many ways it is natural to think of this as the 'problem' or 'goal'. The third part is the 'solution'; a configuration that balances the system of forces or solves the problems presented. Alexander explains that a pattern is both a thing and a process for creating that thing. It describes what you have to do to generate the entity which it define

Christopher Alexander coined the term "PatternLanguage" to emphasize his belief that people had an innate ability for design that paralleled their ability to speak. Chris's book A TimelessWayOfBuilding is the most instructive in describing his notion of a pattern language and its application to designing and building buildings and towns. A pattern language is first a set of patterns, but second it can impose some ordering constraints when the patterns contain pointers to patterns that help complete them. But this is not typically enough. Alexander uses the idea of a “sequence” to teach designers and builders how to construct a coherent artifact. Without some ideas on how to sequence one’s design thoughts, the underlying pattern language is likely to be mostly a diagnostic tool. For an extensive example of the application of patterns, see Chris's other book A Pattern Language. Here he presents over 250 individual patterns that go into the making of successful towns and buildings (in the context of a western, even North American, environment).

Many people accept the definition of a pattern as a proven solution to a problem in a context. Each one documents a reusable solution, encapsulates knowledge about successful practices, and provides information about its usefulness and tradeoffs. Some patterns have been catalogued into collections or pattern libraries. Examples include and . Many companies, including Amazon, Google, IBM, Lucent, Microsoft, Oracle, and Siemens, have written similar pattern collections, some of which are available in books and on websites.

There have been many collections of patterns written, often where authors attempted to weave them into a language. Connected sets of interrelated patterns building on each other can start to form a pattern language, which support a generative, domain specific development process [20 years]. More recently there has been a lot of work toward building pattern languages and improving pattern mining and validation. For example, the Iba lab has outlined Patterns 3.0 pattern languages [IBA] for guiding human action. Additionally the IBA lab has done novel work on pattern mining [refs]. Another example can be found in the Fearless Change patterns which began to build a process for evolving an organization during times of change. Fearless Change began to connect their individual patterns into a language by resolving negative consequences in each pattern with a recommendation for new patterns to use. This is the beginning of sequencing for their patterns.

Patterns are also being successfully used in other fields, such as design, media, arts, IT, management, innovation, music, pedagogy, social activism, social innovation, and grassroots movements.

To find out more about what a pattern is, click on the links below.


  • Hillside Fellowship Award 2016
  • Security Patterns in Practice
  • PLoP Conference Proceedings
  • Asian PLoP
  • EuroPLoP

The Hillside Fellowship Award

Congratulations to Ralph Johnson and Richard Gabriel for being presented the first Hillside Fellowship award at the 2016 PLoP event at Allerton, PLoP 2016 .

Hilside Fellowship Award Recipients 2016

The Hillside Fellowship Program was established in 2016 to recognize members of The Hillside Group who have made exceptional contributions to the Hillside community and to the patterns community at large. The

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Security Patterns in Practice

Eduardo Fernandez's new book " Security Patterns in Practice: Designing Secure Architectures with Software Patterns " has been published.


It is the result of 14 years of producing security patterns with students and colleagues. Almost all of these patterns went through PLoP, EuroPLoP, AsianPLoP, or SugarLoafPLoP. Many of you have participated as shepherds or workshop commentators, the book

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PLoP Conference Proceedings

After the PLoP Workshops, writers are encouraged to modify their papers and submit a final version. The final versions are collected and submitted to the ACM Digital Library. The versions are also available from the conference website.

Conference Proceedings (ACM Digital Library)

Some of the PLoP accepted papers have been published on the ACM Digital Library . The

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Asian PLoP

The premier Asian conference on
Pattern Languages of Programs

AsianPLoP solicits paper submissions written in both of English and Japanese; English papers and Japanese ones will be discussed in different sessions. Both practitioners from the industry and academics are invited to submit their papers. The conference solicits the papers for the following different sessions. Details can be found in Topics

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European Conference on Pattern Languages of Programs

EuroPLoP is a conference that explores, develops and celebrates patterns in software. As with PLoP in the US, the main focus of EuroPLoP will be a series of writer's workshops where pattern authors work together to improve their patterns.

In addition to these workshops there will be discussion groups, BOF sessions and

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Learn More about Patterns


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