Vallee's Behavior-Based Classification and Three-Digit SVP Credibility Rating for UFO Reports: Toward Standardized Global Data Exchange

To the point

Vallee proposes a rigorous, behavior-based system to classify UFO reports and judge credibility with a three-digit SVP score (0–4 for source reliability, site visitation, and likelihood of a natural explanation), expands Hynek’s close-encounter framework to include CE4 (abduction-related reality transformation) and CE5 (permanent physiological effects), notes overlaps that can hinder automated tagging, and aims to standardize cross-dataset evaluation—now adopted by many projects worldwide to improve data exchange—while highlighting uncertainties and the need for ongoing refinement.

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A System of Classification and Reliability Indicators for UFO reports
academia.edu

A System of Classification and Reliability Indicators for UFO reports

No serious study of anomalous phenomena (and particularly those reported in the context of "ufology") can begin without a thorough assessment of the reliability of the data. To that end, a classification system was developed and implemented