REPORT ON THE FOURTH WORKSHOP ON SUSTAINABLE SOFTWARE FOR SCIENCE: PRACTICE AND EXPERIENCES (WSSSPE4) DANIEL S. KATZ(1), KYLE E. NIEMEYER(2), SANDRA GESING(3), LORRAINE HWANG(4), WOLFGANG BANGERTH(5), SIMON HETTRICK(6), RAY IDASZAK(7), JEAN SALAC(8), NEIL CHUE HONG(9), SANTIAGO NÚÑEZ-CORRALES(10), ALICE ALLEN(11), R. STUART GEIGER(12), JONAH MILLER(13), EMILY CHEN(14), ANSHU DUBEY(15), PATRICIA LAGO(16) Abstract. This report records and discusses the Fourth Workshop on Sustainable Software for Science: Practice and Experiences (WSSSPE4). The report includes a description of the keynote presentation of the workshop, the mission and vision statements that were drafted at the workshop and finalized shortly after it, a set of idea papers, position papers, experience papers, demos, and lightning talks, and a panel discussion. The main part of the report covers the set of working groups that formed during the meeting, and for each, discusses the participants, the objective and goal, and how the objective can be reached, along with contact information for readers who may want to join the group. Finally, we present results from a survey of the workshop attendees. (1) National Center for Supercomputing Applications (NCSA) & Department of Computer Science & Department of Electrical and Computer Engineering & School of Information Sciences (iSchool), University of Illinois, Urbana– Champaign, IL, USA;
[email protected]; ORCID: 0000-0001-5934-7525. (2) School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA;
[email protected]; ORCID: 0000-0003-4425-7097. (3) Center for Research Computing & Department of Computer Science and Engineering, University of Notre Dame, IN, USA;
[email protected]; ORCID: 0000-0002-6051-0673.