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