A coach will not receive a passing score for powerful questioning on the ACC exam if the coach does not focus on an inquiring versus telling methodology, if the majority of questions contain already pre-determined answers by the coach, or if the questions attend to an agenda or issues not set by the client, but set by the coach.
powerful questioningを「強力な質問」と訳しましたが誤訳で、「効果的な質問」が正しいと思われます。