The OPVL Framework — Origin, Purpose, Value, and Limitations

OPVL is the engine of IB source analysis. It stands for Origin, Purpose, Value, and Limitations, and it is a disciplined method for evaluating any source. Mastering OPVL transforms vague comments like "this source is biased" into precise, examiner-rewarded analysis. The goal is not to praise or dismiss a source, but to explain what it can and cannot reliably tell a historian about a specific question.

Origin

Origin is the factual identity of the source. Ask: Who produced it? When? Where? In what form (speech, memo, cartoon, memoir, statistic)? Is it published or private? For a written source, note the author's position and access to events. A private diary entry by a general written the night of a battle has a different origin than a memoir the same general publishes twenty years later to