The OOPSLA issue of the Proceedings of the ACM on Programming Languages (PACMPL) welcomes papers focusing on all practical and theoretical investigations of programming languages, systems and environments. Papers may target any stage of software development, including requirements, modeling, prototyping, design, implementation, generation, analysis, verification, testing, evaluation, maintenance, and reuse of software systems. Contributions may include the development of new tools, techniques, principles, and evaluations. Submissions: Submitted papers must be at most 23 pages in 10 point font. There is no page limit on references. No appendices are allowed on the main paper, instead authors can upload supplementary material with no page or content restrictions, but reviewers may choose to ignore it. The PACMPL templates used for SPLASH (Microsoft Word and LaTeX) can be found at the SIGPLAN author information page. In particular, authors using LaTeX should use the acmart-pacmpl-template.tex file (with the acmsmall option). Papers are expected to use author-year citations. Author-year citations may be used as either a noun phrase, such as “The lambda calculus was originally conceived by Church (1932)”, or a parenthetic phase, such as “The lambda calculus (Church 1932) was intended as a foundation for mathematics”.