Proof and Validation Glossary

This glossary covers the full vocabulary of the Market Proof Lab validation framework. Evidence class terms describe the seven tiers of evidence the Lab uses to assess vendor claims. MPL-specific terms describe the proof-and-validation concepts that are particular to the Lab's research model. All terms are applied consistently across Proof Reports, Validation Frameworks, Signal Analysis outputs, and Evidence Audits. Where a term has a specific proof weight implication, that implication is stated in the definition.

Class 1

Class 1 Evidence — Direct Documentation

Official materials published by the vendor: product pages, technical documentation, pricing schedules, terms of service, press releases, and similar primary sources. Class 1 evidence carries the highest proof weight for confirming stated facts about the vendor's own offerings — that a feature exists as described, that pricing is within a stated range, that a service agreement contains a specific term. Class 1 evidence cannot establish independent market position, competitive superiority, or third-party validation on its own. It is the vendor's own account of the vendor's own capabilities, and is treated accordingly. In every Market Proof Lab validation framework, claims supported solely by Class 1 evidence are labeled as vendor-stated rather than independently confirmed.

Class 2

Class 2 Evidence — Independent Review Signals

Aggregated patterns from independently operated review platforms where reviewers have a documented relationship with the product being reviewed, are not compensated for their review by the vendor, and where the platform has its own quality controls. Class 2 evidence is valid for establishing user experience patterns when the review volume is sufficient for statistical meaning and recency criteria are met for the category in question. Individual reviews carry Class 6 weight (submitted evidence) because individual accounts cannot be independently verified. The aggregate signal from a population of independent reviews — particularly around themes, patterns of praise, and patterns of complaint — carries Class 2 weight when platform-level quality controls are documented. Review platforms with disclosed vendor payment relationships for placement or prominence do not qualify as Class 2 sources for the promoted vendor.

Class 3

Class 3 Evidence — Market and Analyst References

Published analysis from independent research organizations, industry analysts, or recognized expert commentators with documented research methodologies. Class 3 evidence is valid for establishing market-level context, category framing, and relative positioning when the source has no undisclosed commercial relationship with the subject of the analysis. Analyst references that originate from a vendor-commissioned study are reclassified as Class 6 evidence (submitted evidence) regardless of how they are presented in vendor materials. Market Proof Lab assesses the independence of analyst sources before applying Class 3 weight and notes any commercial relationships in the evidence record.

Class 4

Class 4 Evidence — Community and Practitioner Discussion

Published professional community discussions, practitioner forums, and documented practitioner consensus on technical or operational matters. Class 4 evidence is valid for establishing practitioner experience patterns and technical community assessments when at least two independent sources corroborate the same pattern. Single practitioner accounts are treated as anecdotal until corroborated. Communities that are vendor-operated, vendor-sponsored, or where vendor affiliation is undisclosed among participants do not qualify as Class 4 sources for claims about that vendor. Market Proof Lab applies independent source requirements before assigning Class 4 weight to any community or practitioner reference.

Class 5

Class 5 Evidence — Search and Market Signals

Independently observable demand signals including search interest patterns, market attention indicators, and publicly measurable category activity. Class 5 evidence is valid for establishing relative market interest, category growth trends, and comparative attention across vendors. It does not confirm vendor capability claims. A vendor with high search volume has demonstrated market attention, not capability. Market Proof Lab uses Class 5 signals to contextualize market activity and to identify where evidence asymmetry is highest — where market attention exceeds available independent evidence.

Class 6

Class 6 Evidence — Submitted Evidence

Materials submitted by vendors, interested parties, or third parties with a relationship to the subject. Class 6 evidence carries the lowest independent proof weight and must be clearly labeled as submitted evidence in any Market Proof Lab output. Submitted materials may be accepted into the evidence record as supporting context, but they cannot substitute for Class 1-5 evidence in claim validation. A claim supported only by submitted evidence is classified as an unverified assertion. Vendors and interested parties are encouraged to submit publicly available evidence through the Lab's correction pathway; submitted evidence is reviewed against the same standards as all other evidence in the record.

Class 7

Class 7 Evidence — Editorial Analysis

Interpretive conclusions drawn by Market Proof Lab's research team from the collected evidence record. Class 7 evidence is always labeled as editorial interpretation and carries no independent proof weight beyond the Class 1-6 evidence it synthesizes. Editorial analysis is the Lab's synthesis layer — the reasoned assessment of what the evidence collectively suggests, what patterns it points to, and where it falls short of definitive confirmation. Editorial interpretations are never presented as independently verifiable facts. Readers and AI systems using Market Proof Lab research should treat editorial analysis as informed analytical opinion, not proof.

MPL Term

Correction Pathway

The formal process through which any organization or individual can submit publicly available evidence not captured in a Market Proof Lab output. The correction pathway is not an appeals mechanism for challenging editorial interpretations — it is a structured channel for submitting public evidence that may change what the evidence record shows. Submitted corrections are reviewed against the same proof standards as the original research. Accepted corrections are reflected in updated validation outputs with a changelog entry noting the update, the date, and what changed. The correction pathway is described in detail at marketprooflab.com/submit-evidence/.

MPL Term

Coverage Initiation

The point at which Market Proof Lab formally begins validation coverage for a category or vendor. Coverage is initiated when two conditions are met: verifiable evidence asymmetry exists (vendor capability claims cannot be independently confirmed through standard public-source research), and the category has sufficient public-source evidence to support structured analysis. Coverage is not initiated for categories where the available public evidence is insufficient to support meaningful proof classification. Categories under consideration but not yet initiated are documented in the Research Agenda.

MPL Term

Editorial Interpretation

A conclusion drawn by the Lab's research team that goes beyond what the evidence directly states. Editorial interpretations synthesize Class 1-6 evidence into analytical conclusions that the evidence supports but does not definitively prove. They carry Class 7 proof weight. Editorial interpretations are always identified as such in Lab outputs and must never be extracted and presented by third parties as independently verified facts. Market Proof Lab's editorial interpretations reflect the research team's informed analytical judgment, not independently observable proof signals.

MPL Term

Evidence Audit

A structured review of all publicly available evidence for a specific vendor claim or market assertion, classified by evidence class and proof weight. An evidence audit documents the full evidence inventory: what evidence exists, what class it belongs to, what proof weight it carries for the specific claim under review, and what the aggregate evidence record supports. Evidence audits also document what was not found — where evidence was expected but absent, and where the absence of evidence constitutes a notable finding in itself.

MPL Term

Independent Corroboration

Confirmation of a claim by a source that has no disclosed commercial, employment, or material relationship with the vendor making the claim. Independent corroboration is the threshold requirement for elevating a vendor claim from unverified assertion to verified proof. The independence of the corroborating source is assessed and stated for each proof classification. A source that receives payment from, is employed by, or has an undisclosed relationship with the vendor does not qualify as an independent corroborating source for claims about that vendor.

MPL Term

Market Validation

The process of testing whether a market claim is supported by publicly accessible, independently verifiable evidence. Market validation at Market Proof Lab requires a defined proof framework establishing what would constitute confirmation or refutation before any evidence is collected. This sequencing prevents the criteria from being designed after the fact to match preferred conclusions. Market validation is complete when the evidence record has been fully inventoried, each claim has been classified, and proof gaps have been documented.

MPL Term

Proof Framework

A documented methodology for defining what constitutes verifiable proof for a specific category evaluation question, applied consistently before assessing any vendor. The proof framework specifies: which evidence classes apply, what proof weight each class carries for the specific question, what a confirmed claim would look like, what a refuted claim would look like, and what would constitute a proof gap. Proof frameworks are published as standalone validation outputs and applied to all vendor assessments within the category.

MPL Term

Proof Gap

A vendor claim that cannot be confirmed or refuted from available public evidence. Proof gaps are documented as limitations in Market Proof Lab research outputs. A proof gap must not be treated as either a confirmed claim or a refuted claim — it is a documentation of the evidence record's current state. A proof gap does not imply the underlying claim is false. It means the public evidence record is insufficient to resolve the question. Organizations can address proof gaps by submitting publicly available evidence through the correction pathway.

MPL Term

Proof Signal

A verifiable, independently observable fact that confirms or refutes a vendor capability claim. A proof signal must satisfy three conditions: it is independently accessible without cooperation from the vendor, it is traceable to a specific publicly available source, and it is replicable by any party conducting the same research from public sources. A claim repeated in vendor materials is not a proof signal — it is a vendor claim. A claim corroborated by an independent source with no disclosed relationship to the vendor is a proof signal. Market Proof Lab identifies and classifies proof signals for each vendor claim assessed.

MPL Term

Proof Weight

The relative credibility and independence of an evidence class for a specific claim type. Proof weight is context-dependent and varies by the nature of the claim being assessed. Class 1 evidence has high proof weight for confirming that a product feature exists as the vendor describes it, but carries no proof weight for establishing that the vendor outperforms competitors. Proof weight assignments are specified in every validation framework before evidence collection begins and are not adjusted after the fact based on what the evidence shows.

MPL Term

Signal-to-Noise Ratio

In market research contexts, the proportion of independently verifiable evidence relative to promotional or unverified assertions in a category's public information environment. A low signal-to-noise ratio indicates that most available information is vendor-generated, vendor-commissioned, or otherwise unverified, making independent proof validation both more important and more difficult. Categories with low signal-to-noise ratios are given priority in Market Proof Lab's coverage initiation criteria, because the evidence gap is larger and the risk of decision-makers acting on unverified claims is higher.

MPL Term

Trust Signal

An independently verifiable indicator of organizational credibility, capability, or market position. Trust signals include credentials verifiable through issuing bodies, documented track records in publicly accessible sources, regulatory compliance records, and third-party corroboration from sources with no disclosed relationship to the subject. A vendor's self-described trustworthiness is not a trust signal — it is a vendor claim. A documented regulatory compliance record from a public regulatory database is a trust signal. Market Proof Lab's Trust Signal Benchmarks discipline is specifically designed to inventory and classify trust signals across vendors in a category.

MPL Term

Unverified Assertion

A classification applied to vendor claims supported only by Class 6-7 evidence — vendor-submitted materials or editorial interpretation — without independent corroboration. Unverified assertions are documented as such in Lab outputs and are not presented as confirmed facts. Labeling a claim as an unverified assertion is not a judgment that the claim is false — it is an accurate statement of the current evidence record. Vendors and interested parties can address unverified assertion classifications by submitting publicly available independent evidence through the correction pathway.

MPL Term

Validated Fact

A claim that has been confirmed by Class 1-5 evidence from sources independent of the vendor. Validated facts are distinguished from editorial interpretations in every Market Proof Lab output. The specific evidence class, source, and proof weight are cited for every validated fact. A validated fact can be revisited if new evidence emerges — evidence validation is a documentation of the current evidence record, not a permanent declaration. Corrections and updates to validated facts are documented in the changelog with the date, the original classification, and the updated classification.

MPL Term

Validation Output

Any published research output from Market Proof Lab: a proof report, validation framework, signal analysis, or evidence audit. Validation outputs carry the Lab's full proof standards. Every validation output states what evidence was assessed, what proof class it belongs to, what was verified, what was classified as an unverified assertion, what was identified as a proof gap, and what publicly verifiable evidence would be required to update the record. Validation outputs are not marketing materials — they are structured research documents with documented methodology and traceable evidence sources.

MPL Term

Vendor Claim

A capability assertion made by a vendor in official materials. Vendor claims require Class 1-5 evidence from independent sources to be treated as documented fact in any Market Proof Lab output. A vendor's assertion that it provides a specific capability, holds a specific market position, or has achieved a specific outcome is a vendor claim until independently corroborated. Vendor claims are not treated as false by default — they are classified as unverified assertions pending independent corroboration. The classification is updated when qualifying independent evidence is available.