Professional Scrum Master I (PSM-I) prep, adaptive plan with ARIA
PSM-I is Scrum.org's Professional Scrum Master Level I cert, the rigorous self-study alternative to Scrum Alliance's CSM. The exam runs 60 minutes, 80 questions, with a passing bar of 85 percent (one of the highest pass-rate thresholds in cert prep). It is online proctored, with a mix of multiple choice and multiple-answer items. There is no mandatory training course (a key differentiator from CSM), the cert never expires, and there is no renewal fee. PSM-I was created and curated by Ken Schwaber, co-author of the Scrum Guide.
What the exam covers
Scrum.org publishes the Subjects framework. Approximate weights:
- The Scrum Framework: ~30%
- The Scrum Team: ~20%
- Scrum Events: ~20%
- Scrum Artifacts and the Definition of Done: ~15%
- Cross-functional, self-managing teams: ~15%
The credential is permanent. You pay once, and it never lapses.
PSM-I vs CSM at a glance
CSM requires a two-day instructor-led course, with typical cost in the $700 to $1500 range, and the exam difficulty sits at 74 percent. PSM-I has no course requirement, and the exam difficulty is 85 percent. CSM expires every two years and carries a renewal fee. PSM-I never expires. The CSM exam is gentler, the PSM-I exam is harder, and the marketplace recognizes both.
How 
ARIA preps you for it
PSM-I is brutal on Scrum-Guide precision. The exam tests strict 2020 Scrum Guide language, not how teams use Scrum in practice. The CAT evaluation lands a per-area skill estimate. Your roadmap is weighted to gaps. The error backlog tags items by trap pattern (using "tasks" when the question is about Increment, calling Sprint Goal an output instead of a commitment, conflating Definition of Done with acceptance criteria). Patterns return at widening intervals so the trap stops working.
Common pitfalls
- Confusing how teams "actually do Scrum" with what the Scrum Guide says. PSM-I tests the Guide. Hybrid practices and team conventions are wrong answers if they conflict with the canonical text.
- Skipping the open assessments. Scrum.org provides three free Scrum Open assessments. Pass each one at 100 percent at least three times before sitting PSM-I.
- Underestimating the 85 percent passing bar. That is 68 of 80 correct. Calibration matters more than on most certs. Aim for 90 percent on practice runs.
Pass guarantee
Same five conditions as every ARIA roadmap. Full refund if you complete the roadmap and do not pass within the 60-day window.