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While these calls provide valuable visual context in real time, the experience of interacting with people and moving around a space is significantly reduced when compared to co-located conversations. Recent work has demonstrated the potential of Mobile Augmented Reality applications to enable more spatial forms of collaboration across distance. To better understand the dynamics of mobile AR collaboration and how this medium compares against the status quo, we conducted a comparative structured observation study to analyze people\u2019s perception of space and interaction with remote collaborators across mobile video calls and AR-based calls. Fourteen pairs of participants completed a spatial collaboration task using each medium. Through a mixed-methods analysis of session videos, transcripts, motion logs, post-task exercises, and interviews, we highlight how the choice of medium influences the roles and responsibilities that collaborators take on and the construction of a shared language for coordination. We discuss the importance of spatial reasoning with one\u2019s body, how video calls help participants \u201cbe on the same page\u201d more directly, and how AR calls enable both onsite and remote collaborators to engage with the space and each other in ways that resemble in-person interaction. Our study offers a nuanced view of the benefits and limitations of both mediums, and we conclude with a discussion of design implications for future systems that integrate mobile video and AR to better support spatial collaboration in its many forms.<\/jats:p>","DOI":"10.1145\/3788073","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T15:29:14Z","timestamp":1779290954000},"page":"1-30","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Studying Mobile Spatial Collaboration across Video Calls and Augmented Reality CSCW037"],"prefix":"10.1145","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8154-3004","authenticated-orcid":false,"given":"Rishi","family":"Vanukuru","sequence":"first","affiliation":[{"name":"ATLAS Institute","place":["Boulder, USA"]},{"name":"University of Colorado Boulder","place":["Boulder, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6083-6251","authenticated-orcid":false,"given":"Krithik","family":"Ranjan","sequence":"additional","affiliation":[{"name":"ATLAS Institute","place":["Boulder, USA"]},{"name":"University of Colorado Boulder","place":["Boulder, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-5739-2176","authenticated-orcid":false,"given":"Ada Yi","family":"Zhao","sequence":"additional","affiliation":[{"name":"ATLAS Institute","place":["Boulder, USA"]},{"name":"University of Colorado Boulder","place":["Boulder, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7477-707X","authenticated-orcid":false,"given":"David","family":"Lindero","sequence":"additional","affiliation":[{"name":"Ericsson Research","place":["Lule\u00e5, Sweden"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8731-2140","authenticated-orcid":false,"given":"Gunilla H.","family":"Berndtsson","sequence":"additional","affiliation":[{"name":"Ericsson Research","place":["Stockholm, Sweden"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9973-1505","authenticated-orcid":false,"given":"Gregoire","family":"Phillips","sequence":"additional","affiliation":[{"name":"Ericsson Inc.","place":["Santa Clara, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4803-1925","authenticated-orcid":false,"given":"Amy","family":"Bani\u0107","sequence":"additional","affiliation":[{"name":"University of Wyoming","place":["Laramie, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3826-408X","authenticated-orcid":false,"given":"Mark D.","family":"Gross","sequence":"additional","affiliation":[{"name":"ATLAS Institute","place":["Boulder, USA"]},{"name":"University of Colorado Boulder","place":["Boulder, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9948-6375","authenticated-orcid":false,"given":"Ellen Yi-Luen","family":"Do","sequence":"additional","affiliation":[{"name":"ATLAS Institute","place":["Boulder, USA"]},{"name":"University of Colorado Boulder","place":["Boulder, USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2026,5,20]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1145\/3411764.3445582"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","unstructured":"Clemens Arth Raphael Grasset Lukas Gruber Tobias Langlotz Alessandro Mulloni and Daniel Wagner. 2015. 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