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Most of you might know Michael James' ScrumMaster Checklist, which already mentioned some tasks regarding improving Product Owner from Scrum Master perspective. Recently Lare Lekman posted a checklist to become a good Product Owner.
I will for sure use it. What I personally like is that Lare tried to cover Product Owner's role 360° and with the point system at the bottom "My current Product Owner Score is ________ / 28 points." you have a neutral KPI as base for discussions.