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Sun 14 - Tue 16 June 2020 London, United Kingdom

NEW! (12 Jun 2020) HOPL IV papers are now available

All 19 HOPL IV papers, as well as an Editorial Message and Appendices explaining the HOPL IV reviewing process, have been published and are now available in the ACM Digital Library as the June 2020 issue of PACMPL.

All PACMPL papers—and therefore all HOPL IV papers—are published Open Access, thus making them freely accessible for all through the ACM Digital Library.

STILL CURRENT!  HOPL IV will be postponed

Because of the COVID-19 (coronavirus) situation, SIGPLAN has determined that there will not be a physical meeting for HOPL or PLDI in June. HOPL IV will be postponed; PLDI 2020 will be a virtual conference. We are working with SIGPLAN to identify a new time and place for the physical HOPL meeting, probably in the first half of 2021.

We will post additional information here once the details have been worked out.

We thank everyone who has contributed so far to HOPL IV by submitting papers, reviewing and shepherding them, and preparing them for publication, and we also thank our amazing sponsors for their support.

Guy Steele and Richard Gabriel, Co-chairs, HOPL IV


The History of Programming Languages conference series produces accurate historical records and descriptions of programming language design, development, and philosophy. It is infrequently held: the first three were in 1978, 1993, and 2007. It’s now time for HOPL IV.

OLD! (28 Feb 2020) We are pleased to announce the List of Accepted Papers. These are the nineteen papers that will be presented in London in June. The complete conference schedule will be posted soon, and conference registration will open in mid-March.

OLD! (22 Feb 2019) Now posted for the benefit of authors (as well as anyone else who cares to look) are two documents that have been used to guide the work of the HOPL IV program committee: HOPL IV Reviewing Principles (a guide for those reviewing HOPL papers, with comments on how HOPL differs from other SIGPLAN conferences) and HOPL Shepherding (a guide for program committee members serving as shepherds).

OLD! (3 May 2018) The submissions website for HOPL IV at hopl4.hotcrp.com is now open. See the updated Call for Papers for detailed instructions on how and when to submit an abstract and then a full paper. Abstracts are due by 31 July 2018; first drafts of full papers are due by 31 August 2018.

OLD! (13 Feb 2018) We have now completed and posted all four sets of Questions for Authors, addressing Early History of a specific language, later Evolution of a specific language, cross-language examination of a specific Feature or Concept, and consideration of a Class of Languages having a common theme or purpose. Authors please see the Content Guidelines for Authors for a description of how to use these questions while preparing a paper.