ACM ISS 2021, http://iss.acm.org/2021/, has two separate reviewing rounds (winter and summer) with separate deadlines. The winter round for ISS 2021 has already passed. This is the call for the summer round of ISS 2021. ISS 2021 Papers Summer Round: Important Dates AoE (Anywhere on Earth) Submission due: July 2, 2021 Notifications to authors: August 13, 2021 Revisions due: September 13, 2021 Final decisions to authors: September 26, 2021 Camera-ready due: October 1, 2021 ISS 2021: November 14-17 ACM Interactive Surfaces and Spaces (ACM ISS) is the premier venue for research on the design, development and use of new and emerging interactive surface technologies and interactive spaces. ACM ISS welcomes original, high-quality research and industry contributions that advance the state-of-the-art in the area of interactive surfaces, interactive spaces and novel interface technologies. Beyond our traditional scope – i.e. interactive tabletops, large displays, multi-display systems, mobile and mini devices – we also encourage contributions focused on the use of space and technology around us to bridge the gap between our digital and everyday lives, such as interactive 3D spaces, on-body sensors, interactive art or interactive architecture. We also encourage contributions focused on understanding individual and group needs related to interactive surfaces and interactive spaces, and the impact on individuals and groups of these technologies. We embrace innovations in a wide variety of areas including design, software, hardware, understanding of use, and applications or deployments of such interactive systems. ISS 2021 will be a hybrid event: Accepted papers are invited to present at the conference, and authors can choose whether or not they wish to present. Because of the evolving situation with COVID-19 and the difficulties of running a physical in-person conference, ACM ISS will allow remote participation. While we do not know what the exact format of the conference will be, we will ensure everyone can present their papers at ISS. Publication model: PACMHCI journal: Starting last year, ISS switched to a journal model of publication. This year, there will be two submission rounds: winter round and summer round, with separate deadlines. Papers published by the Proceedings of the ACM on Human-Computer Interaction (PACMHCI), https://dl.acm.org/journal/pacmhci , accepted in both rounds will be invited for presentation at the ISS 2021 conference. The conference retains its workshop, poster, and demo tracks, which will have their own publication outlet. The call for workshops, posters, and demos will be included in the summer round. Submissions will be done through http://new.precisionconference.com<http://new.precisionconference.com/> Submissions: Submissions to PACMHCI ISS should present original and mature research work. High-quality, elaborated case studies and practice reports with generalizable findings will also be considered. Papers should be written using a template provided by PACMHCI, https://dl.acm.org/journal/pacmhci/submission-templates . Submissions should be anonymized. Primarily, this means that submissions must remove all author and institutional information from the title and header area of the first page. Author information should also be removed from submitted supplementary materials, in particular, videos. Submissions that do not do so may be rejected without review. Furthermore, all references must remain intact. If you previously published a paper and your current submission builds on that work, the complete reference with the author's name must appear in the references. Authors must refer to their previous work in the third person (e.g., “We build on prior work by Smith et al. [X] but generalize their algorithm to new settings.”) and avoid blank references (e.g., “12. REMOVED FOR REVIEWING”). Further suppression of identity in the body of the paper (for example, in an Acknowledgements section), while encouraged, is left to the authors’ discretion. Paper Length: We recommend a page length in the new format of between 5-15 pages + any additional pages for references. There are no length restrictions on papers, however, reviewers will put the length of any submitted paper in context of the provided contribution when making decisions about acceptance and revisions. Revisions: The associate editors will make decisions for any submitted papers as either accepted, minor revisions, major revisions, or rejected. These notifications will then be sent to the authors. If the initial decision is "minor revisions", the authors will revise their paper within this round. After the revised paper is submitted, the final decisions will be sent to the authors a few weeks later. If the initial decision is "major revisions", the paper must be submitted in the next round to guarantee treatment as a revision, meaning that the same primary and secondary board members will be assigned to continuously handle the submission. Submissions requiring "major revisions" will not submit their revision within the current round, to allow extra time for any significant new work, such as conducting a new evaluation, before acceptance is possible. This means that papers accepted in the winter or summer round will be able to present their paper at ISS of the same year. A paper submitted in the summer round that received a major revision decision will not be presented at ISS of the same year but might be presented at ISS of the next year if accepted in the following winter round. Topic Areas: The conference welcomes contributions on a wide range of topics relating to interactive surfaces and spaces as well as novel interface technologies, including (but not limited to): • Large display interfaces and multi-display environments • Gesture-based interfaces (hands, finger, body) • Multimodal interfaces • Tangible user interfaces • Novel interaction techniques and paradigms • Interaction with mobile and body-worn devices • Different materials and form factors: curved, sand, water, ... • Interactive 3D spaces (Mixed Reality and Augmented Reality, mid-air displays, ...) • Large scale and outdoor interactive spaces (projected interfaces, drones, ...) • Interactive architecture • Beyond traditional surfaces: shape-changing and actuated surfaces, body-related, ... • Interactive information visualization/data presentation • Software engineering methods and frameworks • Social aspects and protocols related to interacting with surfaces and spaces • Interactive surfaces and spaces that support group work or social interaction • Hardware, including sensing and input technologies with novel capabilities, and results from maker communities • Human-centered design and methodologies related to interactive surfaces and spaces • Empirical evaluations of novel interactive surfaces and/or spaces designs • Evaluations of deployed interactive surfaces and/or spaces in specific domains (public spaces, education, science, business, entertainment, health, art, homes, etc.) Petra Isenberg, Hans-Christian Jetter, and Morten Fjeld ACM ISS 2021 Paper Chairs