CHI Supplementary Materials

CHI Supplementary Materials

CHI collects the paper, the video figure, and every supplementary file together on the one submission deadline (September 10, 2026 for CHI 2027, per chi2027.acm.org, read 2026-07-08). There is no later supplement slot, so supplement production is deadline-week work that must be scheduled like writing. Everything uploaded is part of the anonymous review record; everything accepted ships to the ACM Digital Library beside the paper, permanently.

What goes where

The self-containment rule cuts across all of it: reviewers must be able to judge the contribution from the PDF alone. Supplements deepen; they never carry a load-bearing result.

The video figure

SIGCHI's video guide (sigchi.org/resources/guides-for-authors/videos/) sets the expectations this pack verifies: video figures illustrate key aspects of the work, run up to about five minutes, are archived in the DL, and every video needs a closed-caption file (SRT, SBV, or VTT). Craft rules that survive review:

• Show the interaction, not slides. Thirty seconds of real use beats two minutes of bullet points read aloud.
• Leave titles on screen long enough to read (the guide suggests up to ~10 seconds for video figures).
• Anonymize the audio track too: no narrator saying the lab's name, no institutional logos on walls or screens, no identifiable bystanders, and consent for every visible participant — including for eventual public archiving, not just review.
• Write the caption transcript yourself (or correct an auto-transcript line by line); auto-captions mangle technical vocabulary exactly where precision matters.