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Glossary/Literature review grades

Single study (literature)

One named study only. A real measurement, but one measurement — never "the literature".

The definition the product enforces, read from the same code the methodology page renders.

How to read it

When Single study appears on a page

One named study. A real measurement, but one measurement, and the review says so rather than letting one paper stand for a field.

The family

Literature review grades

What a body of studies is allowed to be said to show, and whether the question was studied as asked.

Convergent (literature)At least two INDEPENDENT named studies — different teams or datasets — point the same direction. The only grade that earns "the literature shows".Preliminary (literature)A preprint, pilot, working paper or small-n result that has not been replicated or peer-validated. Marked as what it is.Mixed (literature)Named studies genuinely disagree. The split is the finding; the sides are named, never averaged.Contested (literature)A published critique, failed replication, or retraction lead targets the supporting record. A finding, not noise.Not established (literature)The claim circulates — in coverage, marketing or folklore — without a study behind it that this review could find.Directly studied (answerability)The literature studied this question as asked.Adjacent only (answerability)The literature studied related questions — proxies, narrower populations, different timescales. Every finding names what was actually studied.Unstudied (answerability)No study addresses the question. Saying so IS the review.
Where you will see it

On these pages

Kinds of research that print it
Literature Review →
Surfaces
The Literature Review page and its /p render
The rubric

The whole grading vocabulary, on one page

Every grade here is assigned by the same rules on every scan, and the methodology page renders those rules from the code that enforces them.

How the grades work →The whole glossary