1st International Workshop on API Usage and Evolution

("La Boca" by Ester Inbar. Available from Attribution through Wikimedia Commons)

WAPI will be held on Tuesday May 23rd 2017 and will be co-located with the 39th International Conference on Software Engineering (ICSE 2017) in Buenos Aires, Argentina.

Follow us on Twitter @wapi2017 and spread the word with #wapi17!


Session 1: Opening & Keynote

9:00 - 9:15
Workshop Opening & Introductions
9:15 - 10:30
“Human-centered Methods for Improving API Usability”
Workshop Keynote by Brad Myers (CMU)
10:30 - 11
Coffee Break

Session 2: API Specification and Usage

11:00 - 11:25
“On the Role of Fitness Dimensions in API Design Assessment - An Empirical Investigation”
by Amir Zghidi, Imed Hammouda, Brahim Hnich, and Eric Knauss (University of Monastir, Chalmers and University of Gothenburg)
11:25 - 11:50
“API Usage in Descriptions of Source Code Functionality”
by Paige Rodeghero, Collin McMillan, and Abigail Shirey (University of Notre Dame)
11:50 - 12:15
“Opportunities in Software Engineering Research for Web API Consumption”
by Erik Wittern, Annie T.T. Ying, Yunhui Zheng, Jim A. Laredo, Julian Dolby, Chris Young and Aleksander Slominski (IBM Research, IBM T. J. Watson Research Center)
12:15 - 12:30
Discussion of presented topics & listing of open questions/topics for Session 4
12:30 - 2:00
Lunch Break

Session 3: API Evolution

2:00 - 2:45
“API Evolution and Migration at Google”
Industry talk by Hyrum Wright (Google)
2:45 - 3:10
“Mining Motivated Trends of Usage of Haskell Libraries”
by Marc Juchli, Lars Krombeen, Shashank, Chak Shun Yu, Anand Ashok Sawant, Alberto Bacchelli (Delft University of Technology)
3:10 - 3:30
“Type Checking for Reliable APIs”
by Maria Kechagia and Diomidis Spinellis (Athens University of Economics and Business)
3:30 - 4:00
Coffee Break

Session 4: Open Discussion

4:00 - 4:15
Add extra topics for discussions from Session 3
4:15 - 5:15
Breakout sessions & discussion of open topics
5:15 - 5:30
Workshop closing

Call for Papers

Application Programming Interfaces (APIs) are an essential mechanism for software reuse. However, over the past two decades, many researchers have shown inherent problems with APIs, such as the lack of useful documentation for proper use, incorrect usage of APIs that lead to bugs and security vulnerability, and difficulties in migrating between API versions. While previous efforts in solving these problems have advanced the state of the art, many of these issues still exist today. We believe it is time to reflect and compare experiences from different perspectives and to come up with new solutions to the above challenges.

The 1st International Workshop on API Usage and Evolution (WAPI) will be co-located with the 39th International Conference on Software Engineering (ICSE 2017) in Buenos Aires, Argentina. WAPI provides a venue for researchers and practitioners to come together and discuss the open challenges that API users and designers face. For example, how can we measure the quality of an API? How can we accurately rely on client code for identifying patterns when the rule of “the majority do it right” does not always hold (e.g., in security-related APIs)? What is the best way to present API recommendations and API usages to a developer? How can we measure or improve the usability of an API? The goal of the workshop is to identify the current open challenges in the area and define a roadmap for innovative solutions.


Topics of interest include, but are not limited to:

  • API quality metrics
  • API usage patterns
  • API misuse detection
  • API specification/documentation
  • Support for evolution of API documentation
  • API usability & design
  • API evolution and migration
  • Library/framework recommendations
  • Leveraging different sources of data to perform any of the above tasks
  • Suitable representations for usage patterns
  • User-friendly ways of presenting API and API-usage recommendations to the developer
  • User perspectives of API usage and evolution
  • Designer perspectives of API design and evolution
  • Negative experiences (what did not work)
  • Identification of open challenges and proposed solutions
  • Synergies between API challenges and other research areas

Submission Information

WAPI 2017 invites contributions in the form of 4-page papers from both researchers and practitioners, as well as talk abstracts from practitioners. Paper submissions can be research papers, practice papers, position papers, or experience reports. All submissions should describe unpublished work and must have been neither previously accepted for publication nor concurrently submitted for review in another journal, book, conference, or workshop. All submissions are peer-reviewed and accepted papers will appear in the workshop proceedings. All submissions should be made through EasyChair.

Important Dates

Submissions due
Friday January 20th 2017

Friday January 27th 2017

Notification to authors
Friday February 17th 2017
Camera-ready copies due
Monday February 27th 2017


Program Committee

  • Abram Hindle, University of Alberta
  • Reid Holmes, University of British Columbia
  • Christian Kästner, Carnegie Mellon University
  • Rob Walker, University of Calgary
  • Sebastian Proksch, TU Darmstadt
  • Luca Ponzanelli, University of Lugano
  • Nikolaos Tsantalis, Concordia University
  • Annie T.T. Ying, IBM T. J. Watson Research Center
  • Collin McMillan, University of Notre Dame
  • Latifa Guerrouj, École de Technologie Supérieure
  • Ian Kelly, Code Pilot (CA Accelerator)
  • Hyrum Wright, Google