Concept Library
Every core LSAT concept, explained.
Deep-dive explainers for the concepts that appear on every LSAT: assumptions, causal reasoning, conditionals, structural reading, and more.
Logical Reasoning
Necessary vs. Sufficient Assumption: The Definitive LSAT Explainer
A necessary assumption must be true for the argument to hold — negate it and the argument collapses.
Logical Reasoning
Causal Flaws on the LSAT: Every Pattern, Every Trap
Causal flaws account for roughly 30% of all Flaw and Weaken questions on the modern LSAT.
Logical Reasoning
LSAT Conditional Reasoning: Contrapositives, Chains, and Common Errors
'If A, then B' has one valid inference: the contrapositive — if not B, then not A.
Reading Comprehension
LSAT Reading Comprehension: The Passage-Mapping Method
Every LSAT passage has four extractable elements: main point, author's viewpoint, counterview, and scope.
Logical Reasoning
Parallel Reasoning and Parallel Flaw: A Structural Approach
Parallel Reasoning is about structural form, not subject matter — treat the stimulus as an equation to be matched.