Corroboration requires active comparison among multiple sources on similar subjects and from similar periods. Agreement supplies a defensible consensus and several references for the same point. Outliers may contribute information that the majority view misses, so disagreement deserves attention too. Critical history writing establishes what sources share, then explains where and why they diverge.
Chapter · 5:48-6:40
Use corroboration to find consensus and outliers
Comparing several books and journal articles helps establish a consensus view while preserving dissenting sources for critical analysis.