Worried that a method change in your disproportionality screening might not survive an inspection? By the end of this concise lesson you’ll be able to explain, justify, and document a switch in disproportionality method in inspector‑ready English—linking problem → method → evidence → governance. You’ll find clear, plain‑English definitions of common metrics (EBGM, PRR, ROR, IC025), guidance on when and why to change methods, ready‑to‑use phrasing and templates, real examples, and short exercises to test your ability to produce auditable, defensible justifications.