PSM 2 is an advanced Scrum Master certification exam from Scrum.org. PSM I validates your knowledge of the Scrum framework elements, while PSM II tests your understanding and interpretation of Scrum guiding principles.   If you're deciding between CSM and PSM, check out how PSM 2 compares to A-CSM, the Scrum Alliance's second-level Scrum Mastery certification.   In this article,...