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    I’m not familiar with the CQR abbreviation, what does it stand for? Commented Sep 8, 2021 at 15:37
  • @RikD I meant CQS. I'll update the post. Thanks. Commented Sep 8, 2021 at 15:41
  • "... things like, "Can't check Completed until Receive Date has a value." and "Can't check Completed if not in the Manager role." are business rules" — those would be used interface rules. The business rule would be "a product return cannot be completed without a return date, and only managers can complete product returns." The UI should respond to this logic by disabling the checkbox. Commented Sep 8, 2021 at 20:34
  • @RikD: maybe the OP meant CQRS (Command-Query Responsibility Segregation)? CQS is a little different, and I thought CQRS involved commands like the OP mentioned in this question. Commented Sep 9, 2021 at 2:24
  • @GregBurghardt CQS is Command Query Separation, which also involves commands. They are similar, but different. martinfowler.com/bliki/CommandQuerySeparation.html Commented Sep 9, 2021 at 12:56