Submissions to ACM UbiComp should follow the ethics review policies of the relevant institutions/countries/funding bodies. Formal submission forms for ACM UbiComp will include a tickbox allowing authors to quickly self-certify if this was done (and no paper should be accepted for review where this box is not ticked). Reviewers should NOT take it upon themselves to comment on the ethics of the methodologies of papers under review, and must not e.g. lower the score of a paper because it would have failed their own ethics process. If a reviewer has strong reason to believe that this box was incorrectly ticked they should report it to the PC chairs.