MECE - mutually exclusive and comprehensively exhaustive.

http://scrum.jeffsutherland.com/2013/01/requirements-for-product-owner-common.html

http://blog.ivarjacobson.com/the-achilles-heel-of-agile/

http://scrum.jeffsutherland.com/2012/05/on-fighter-pilots-and-product-owners.html

В то время, как скрам-команда выполняет P-D-C-A (Plan - Do - Check - Act) цикл, Product Owner следует циклу O-O-D-A (Observe - Orient - Decide - Act).