Corroborative Review

The Corroborative Review is the standing procedure by which the Librarians test whether an Observed Phenomenon may be said to have occurred in more than one place at more than one time. It is not itself a Verification Methodology. It is the audit performed upon a Methodology's output, and it is the only stage at which a record becomes eligible for incorporation into the permanent register of any given floor. The procedure is administered out of the Hall of Perpetual Review and takes its authority from Seventh Concordance, Supplement 12-β, which codifies the four-stage sequence set out below. Where practitioners speak simply of "the Review," they mean the fourth stage.

Procedure

The Review proceeds in four stages, each of which must be completed in written form before the next may be opened. A stage left unfinished for more than eleven cycles is treated as abandoned, and the file is returned to the originating floor with a notation of incomplete corroboration.

Lodgement is a formality and is frequently done by clerks who have not read the underlying record. Collation is not a formality. It is at Collation that independent observations are set beside one another and checked for what Corroborative Resonance requires of them: that they be independent in fact and not merely in signature.

Independence of Witnesses

The Review's central inquiry is the independence of the witnesses. Two observations drawn from the same stairwell, within the same twenty-four cycles, by parties who are aware of each other's filings, will not corroborate; they will confirm, which the Review treats as a weaker and largely administrative class of agreement. The distinction is set out at length in the Partial Survey, whose Section Gamma remains the standard demonstration.

In practice the Review applies a proximity test: witnesses recorded within three floors and nine cycles of one another are presumed non-independent unless a counter-brief is filed. Counter-briefs succeed in roughly one case in four. The remainder are entered in the comparison sheet with the independence flag struck through, and the record proceeds to adjudication already diminished.

Adjudication and the Delta Threshold

Stage IV is sealed. The reviewer is presented with the collated record alone; the identity of the witnesses and the floor of origin are withheld. The reviewer determines whether a drop in ambient Delta (δ) was recorded at the point of each observation and whether the drops are consistent with one another. Consistency is not similarity. Two drops of differing magnitude may corroborate if their interval is stable; two drops of identical magnitude may fail if the intervals are unrelated.

The threshold for a successful Corroborative Review is a recorded drop of 0.4 δ or greater sustained across intervals of no more than thirteen cycles. Records falling below the threshold are not rejected. They are annotated as weakly corroborated and remain in the holding of their floor, available for later corroboration by subsequent observations.

Contradiction Between the Concordances

There is a longstanding and unresolved disagreement concerning whether the Review is a stage of the Ontological Review or a parallel instrument operating upon it.

The Seventh Concordance, Supplement 12-β treats the Corroborative Review as the final stage of the Ontological Review, and the Board of Equitable Review has ruled consistently in favour of this reading since its eighty-third sitting. The Annals of Jurisprudence, however, records an earlier interpretation under which the two are independent and a record must satisfy each separately. Clause 19 of the Third Concordance is silent on the point, listing Corroborative Resonance among its permissible methodologies without addressing the audit performed upon them.

Because the Concordances are amended more often than they are read, the discrepancy has never been formally closed. Practitioners resolve it locally. Floors that hold with the Supplement submit a single file; floors that hold with the Annals submit two. Both are accepted at the Hall of Perpetual Review. The duplication has produced a persistent renewal backlog, discussed in Review of Floor Stability and attributed there to clerical fatigue.

Refusal and Consensual Absence

A Corroborative Review may conclude without corroboration and without failure. Where the record is consistent with a thing that did not occur, the reviewer may enter a finding of Consensual Absence, provided the witnesses agree in writing that the non-occurrence has left a measurable trace. Findings of Consensual Absence are recorded separately and are not counted against the floor's annual quota.

Corroboration is not the opinion of two persons that a thing happened. It is the record of two persons having been, for a time, in the same condition. The Review is an instrument for distinguishing between these.

— Notes toward a working definition, undated, circulated among reviewers of the Annex of Perpetual Review

Appeal

A failed Review may be appealed once, and only on procedural grounds. Substantive appeals are heard by the Cross-Reference Review, which refers most of them back. The appeal rate stands at one in nine; the success rate at one in forty. Reviewers are required to sit a Substantive Review before elevation to Stage IV authority, and most do not. The Examination of Sealed Adjudication, held irregularly, has been sat by forty-one persons since the current procedure was adopted. Thirty-eight passed.