What Must Be True? β Assumptions, Warrants & Stress Tests of ArgumentsA print-ready workbook for IB TOKβand anyone who teaches rigorous reasoning and critical thinking.Why this resourceArguments fail (or succeed) on whatβs unstated. This workbook trains students to surface the assumptions a claim needs, make warrants explicit (βbecause if ___, then ___β), and run stress tests (confounds, missing data, bad analogies, overreach). Designed for TOK, but equally useful in ELA/Rhetoric, AP Semin