Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages.

The Scala Symposium is a forum for researchers and practitioners to share new ideas and results of interest to the Scala community. We welcome a broad spectrum of research topics and many formats.

# Important dates
* No abstract registration
* Paper submission **deadline extended to**: July 20th, 2017
* Paper notification: Aug 20th, 2017
* Student talk submission: Aug 30th, 2017
* Camera ready: Sep 11th, 2017
* Student talk notification: Sep 17th, 2017

All deadlines are [“Anywhere on Earth” (AoE)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Scala+2017+-+Paper+Submission&iso=20170710T00&p1=3399).

# Topics of Interest
We seek submissions on all topics related to Scala, including (but not limited to):

- Language design and implementation – language extensions, optimization, and performance evaluation.
- Library design and implementation patterns for extending Scala – stand-alone Scala libraries, embedded domain-specific languages, combining language features, generic and meta-programming.
- Formal techniques for Scala-like programs – formalizations of the language, type system, and semantics, formalizing proposed language extensions and variants, dependent object types, type and effect systems.
- Concurrent and distributed programming – libraries, frameworks, language extensions, programming models, performance evaluation, experimental results.
- Big data and machine learning libraries and applications using the Scala programming language.
- Safety and reliability – pluggable type systems, contracts, static analysis and verification, runtime monitoring.
- Interoperability with other languages and runtimes, such as JavaScript, Java 8 (lambdas), Graal and others.
- Tools – development environments, debuggers, refactoring tools, testing frameworks.
- Case studies, experience reports, and pearls.

# Submission Format
To accommodate the needs of researchers and practitioners, as well as beginners and experts alike, we seek several kinds of submissions, all in **`acmart/sigplan`** style, **10pt** font.

- **Full papers** (at most 10 pages, excluding bibliography)
- **Short papers** (at most 4 pages, excluding bibliography)
- **Tool papers** (at most 4 pages, excluding bibliography)
- **Student talks** (short abstract only, in plain text)

Accepted papers (either full papers, short papers or tool papers, but not student talks) will be published in the ACM Digital Library.
Detailed information for each kind of submission is given below. Formatting requirements are detailed on the symposium website at
http://conf.researchr.org/track/scala-2017/scala-2017-papers#Instructions-for-Authors.

Please note that at least one author of each accepted contribution must attend the symposium and present the work. In the case of tool demonstration papers, a live demonstration of the described tool is expected.

## Full and Short Papers

Full and short papers should describe novel ideas, experimental results, or projects related to the Scala language. In order to encourage lively discussion, submitted papers may describe work in progress.
Additionally, short papers may present problems and raise research questions interesting for the Scala language community.
All papers will be judged on a combination of correctness, significance, novelty, clarity, and interest to the community.

In general, papers should explain their original contributions, identifying what has been accomplished, explaining why it is significant, and relating it to previous work (also for other languages where appropriate).

## Tool Papers

Tool papers need not necessarily report original research results; they may describe a tool of interest, report practical experience that will be useful to others, new Scala idioms, or programming pearls. In all cases, such a paper must make a contribution which is of interest to the Scala community, or from which other members of the Scala community can benefit. Tool papers should be marked as such in their title.

Where appropriate, authors are encouraged to include a link to the tool's website. For inspiration, you might consider advice in http://conf.researchr.org/track/POPL-2016/pepm-2016-main#Tool-Paper-Advice, which we however treat as non-binding. In case of doubts, please contact the program chairs.

## Student Talks

In addition to regular papers and tool demos, we also solicit short student talks by bachelor/master/PhD students. A student talk is not accompanied by paper (it is sufficient to submit a short abstract of the talk in plain text). Student talks are about 5-10 minutes long, presenting ongoing or completed research related to Scala. In previous years, each student with an accepted student talk received a grant (donated by our sponsors) covering registration and/or travel costs.

## Open Source Talks

We will also accept a limited number of short talks about open-source projects using Scala presented by contributors. An open-source talk is not accompanied by a paper (it is sufficient to submit a short abstract of the talk in plain text). Open-source talks are about ~10 minutes long and about topics of relevance to the symposium, for instance (but not only) presenting or announcing an open-source project that would be of interest to the Scala community.

# Submission Website

The submission will be managed through HotCRP: https://scala17.hotcrp.com/

For questions and additional clarifications, please contact the conference organizers.

# Keynote Speakers

We are delighted to have two excellent keynote speakers this year:

- Reynold Xin, co-founder and Chief Architect, Databricks
- Dwayne Reeves, technical lead manager on the Hack Programming Language team, Facebook

# Program Committee

- Aggelos Biboudis, EPFL
- Edwin Brady, University of St Andrews
- Eugene Burmako, Twitter
- Eva Darulova, MPI-SWS
- Lars Hupel, TU Munich
- Pablo Inostroza, CWI
- Oleg Kiselyov, Tohoku University
- Martin Odersky, EPFL
- Bruno C. d. S. Oliveira, The University of Hong Kong
- Guido Salvaneschi, TU Darmstadt
- Ilya Sergey, University College London
- Anthony Sloane, Macquarie University
- Philippe Suter, Two Sigma
- Frank Tip, Northeastern University
- Sam Tobin-Hochstadt, Indiana University
- Niki Vazou, University of Maryland

# Organizers

- Heather Miller, EPFL (General Chair)
- Philipp Haller, KTH Royal Institute of Technology (Program Chair)
- Ondřej Lhoták, University of Waterloo (Program Chair)
- Paolo Giarrusso, University of Tübingen
- Jonathan Brachthäuser, University of Tübingen

# Sponsors

We thank our sponsor Lightbend for supporting some of the talented
student attendees of Scala '17.

# Links

* Scala '17: http://conf.researchr.org/track/scala-2017/scala-2017-papers
* Submissions: https://scala17.hotcrp.com/
* SPLASH '17: http://2017.splashcon.org/