Bas Voode introduced the Nokia Test to us ScrumTrainers a couple of years ago. Thanks to the promotion of Jeff we started to consider whether this test might help teams to understand if they “really” do Scrum.
The slides show you the questions.
If you fail one of them you have a high risk impediment and you should solve it immediately.
Jeff did a very nice presentation about Scrum or Not Scrum. if you do Scrum or not here: InfoQ.