Evidence-Based Grading

Evidence-based grading is the disciplined practice of assigning a condition grade from observable, repeatable and explainable evidence rather than from expectation, rarity, price, provenance, seller confidence or personal enthusiasm. The grade is the end of the process. The evidence is its foundation.

A collector does not begin with, 'This looks like a high-grade example.' They begin with four separate questions: what can be observed, what those observations probably mean, how the relevant grading convention treats them, and what grade or qualification the evidence can support. Keeping those stages separate prevents a conclusion from disguising itself as a fact.

Evidence-based grading is not a universal scale and it does not make judgement disappear. It is a method for applying whatever scale, terminology or category convention governs the collectible. Its purpose is to make the reasoning visible enough that another competent person can inspect, challenge or reproduce it.

Collector scenario

Two objects, the same attractive label

Two copies of the same collectible are both described as excellent. The first listing supplies the word and three flattering front-facing photographs. The second records a clean front surface, light edge rubbing, one small reverse crease, complete inserts, a firm spine, no visible staining under angled light and no evidence of restoration within an external visual inspection.

The second seller has not necessarily produced a perfect grade. They have produced an examinable judgement. The evidence, the inspection limits and the reasons for the conclusion are visible. The first claim may be correct, but it asks the buyer to trust a label without seeing the path that supports it.

Evidence-based grading does not require an essay for every duplicate. It requires enough visible reasoning for the consequence of the grade.

The chain from object to grade

Grading compresses a complex physical object into a short word or number. A coin becomes MS 64, a comic 8.0, a card Near Mint, and a boxed toy 'excellent'. Yet the object contains much more information: wear, fading, missing parts, structural weakness, manufacture, handling, treatment and environmental change. The grade is therefore a conclusion drawn from the evidence, not the evidence itself.

1. Object

The collectible as it exists now

Grade the present object, not its rarity, former appearance, potential after treatment or hoped-for condition.

2. Observation

What is physically present

Record wear, damage, completeness, originality, instability, treatment evidence and inspection limitations before choosing grade language.

3. Interpretation

What the evidence means

Decide whether a feature is production-related, post-production, active, stable, altered, restored, replaced or still uncertain.

4. Standard

How the system treats it

Apply the declared category convention, including thresholds, qualifiers, component rules and any non-standard outcomes.

5. Grade

The supported conclusion

State the grade with its controlling evidence, limiting defect, qualifications, examination scope and confidence.

Grade the object that exists

Do not grade what the object once looked like, might look like after cleaning, supposedly deserved because of rarity, or would have achieved without one inconvenient defect. Historical importance, provenance, desirability and scarcity may transform value without improving physical condition.

Condition claim

What physical evidence is present now?

Separate market question

How desirable or valuable is this object despite that condition?

What counts as grading evidence?

Grading evidence is any reliable observation that helps establish current physical condition, completeness, originality or degree of alteration. Evidence differs in strength. The collector's task is not merely to collect statements, but to understand what each statement can legitimately prove.

Primary evidence

Direct physical evidence

Visible or otherwise directly detectable condition features usually carry the greatest weight. These include wear, tears, creases, dents, corrosion, staining, fading, foxing, abrasion, paint loss, missing material, residue, broken seals, looseness and movement.

Direct evidence is strongest when it is clearly located, described and repeatable. 'A 12 mm colour-breaking crease at the lower-right corner' is more useful than 'corner damage'.

Construction and behaviour

Structural evidence

Some problems are revealed by how an object behaves rather than by how it looks from the front: a weakened hinge, brittle paper, a warped board, a cracked plastic joint, separated laminate, loose binding, impaired mechanism or rattling internal component.

An attractive object can therefore be structurally compromised. Surface appearance must not be allowed to conceal instability.

Viewing method

Optical and instrument-assisted evidence

Raking light, transmitted light, magnification, ultraviolet illumination, measurement, weighing and microscopy may reveal hairlines, gloss disturbance, shallow impressions, retouching, erased marks, altered texture or dimensional inconsistency.

Tools reveal evidence; they do not interpret it automatically. Their results still need category knowledge and a declared grading standard.

Contextual support

Comparative evidence

Authenticated reference examples, manufacturer specifications, adjacent-grade examples, recognised grading guides and archival images can help identify normal construction and interpret borderline features.

Comparison should illuminate the actual object. It must not become a substitute for examining it.

Recorded history

Documentary evidence

Invoices, treatment records, earlier photographs, prior grading notes and documented component histories may establish restoration, replacement, previous damage or change over time.

Documentation can be highly valuable without overriding current inspection. A ten-year-old grade records an earlier judgement, not a guarantee of present condition.

Weak support

Testimony and market inference

Statements such as 'never opened', 'stored carefully', 'from a famous collection' or 'sold for a premium' may guide investigation but should not settle a condition grade.

Reputation, price and provenance can increase confidence in a story while adding no new evidence about the object's physical state.

An evidence hierarchy

The hierarchy below is not a rigid law, but it is a useful discipline when different sources conflict. Stronger evidence should normally control weaker evidence unless there is a clear reason not to trust it.

Level	Evidence	Example	Typical weight
1	Direct, repeatable physical evidence	A visible crease, missing page, fractured hinge, measurable centring ratio or broken seal.	Usually strongest
2	Corroborated diagnostic evidence	Several independent signs collectively indicating cleaning, retouching, replacement or moisture damage.	Strong when convergent
3	Relevant reference comparison	Comparison with authenticated examples, original specifications or published grading illustrations.	Strong only when the reference fits
4	Documentary or historical evidence	Conservation records, earlier photographs, invoices or prior grader notes.	Useful but potentially incomplete or outdated
5	Testimonial evidence	Statements from owners, dealers or sellers about handling, storage or originality.	Investigative lead, not conclusion
6	Market inference	Price, auction language, famous ownership or population status treated as proof of grade.	Weak grading evidence

Observation before interpretation

A common grading failure is to write an interpretation as though it were an observation. The result cannot be independently checked because the evidence has disappeared inside the conclusion. Better records name the physical feature first and only then classify its likely cause and grading consequence.

Weak

'The card has handling damage.'

This mixes observation and interpretation. It does not identify the feature, its location, extent or whether it is visible on both sides.

Stronger observation

'A diagonal surface indentation approximately 18 mm long is visible under oblique light near the lower-right corner.'

The statement can be checked. Interpretation can follow: is it a crease, a manufacturing impression, broken fibre or a shallow pressure mark, and how does the standard treat it?

Weak

'The coin has been cleaned.'

The conclusion may be correct, but the record hides the evidence supporting it.

Stronger observation

'Parallel hairlines cross the fields, reflectivity differs around protected devices and residue remains inside the lettering.'

The physical signs are recorded first. Cleaning becomes an interpretation supported by multiple observations rather than an unexplained label.

The three-layer record

Evidence

What is physically present?

Interpretation

What kind of condition event is it?

Grading consequence

How does the declared standard treat it?

The same physical evidence can have different consequences across categories. A small crease may be decisive on a modern trading card, one of several factors on an antique dust jacket, structurally important on a folded map, or an expected original fold on an issued insert. Evidence-based grading is standard-relative, not mechanically universal.

Declare the governing standard

A grade has meaning only within a system. '8' is incomplete unless the reader knows the category, scale, threshold rules, treatment of restoration, use of qualifiers, completeness rules, packaging treatment and whether eye appeal can modify the result. A collector-created ten-point scale is not automatically invalid, but it must be defined before others can interpret it.

Undefined

'Grade: 8'

The reader cannot tell what was assessed, which criteria apply or what defects are permitted.

Declared

'Estimated Very Fine under the stated book-grading convention'

The system, category and provisional nature of the conclusion are visible.

A complete evidence-based grading workflow

The workflow below is deliberately sequential. Its value lies in preventing a hoped-for grade from organising the inspection backwards.

Identify the object correctly

Establish type, issue, edition, variant, material, expected construction, intended finish and original components. A normal production feature can otherwise be mistaken for damage, while later alteration can be excused as manufacture.

Confirm the exact issue or variant.
Know the expected materials and construction.
Identify normal manufacturing irregularities before grading.

Declare the examination conditions

State whether the object was examined in hand, through a holder, inside packaging, from photographs, under magnification or with concealed areas. Access determines how much confidence the conclusion deserves.

In person or remote photographs?
Raw, framed, sealed, boxed or encapsulated?
Which surfaces, interiors or components were inaccessible?

Divide the object into condition axes

Inspect the object systematically rather than allowing its most attractive face to dominate. The relevant axes vary by category, but surface, edges, structure, completeness, originality, function and packaging often need separate attention.

Use category-specific axes.
Inspect backs, bases, interiors and fastening points.
Grade components separately when one global grade would conceal too much.

Record defects before proposing a grade

For each material observation, note its type, location, extent, severity, likely origin, stability and image reference. Delaying grade language reduces anchoring and confirmation bias.

Describe before evaluating.
Distinguish active deterioration from stable historical damage.
Photograph features that may control the grade.

Separate manufacture from later condition

Off-centring, print lines, mould seams, weak strikes, assembly marks and inherent material inclusions may originate in production. Wear, fading, moisture, corrosion, glue repair, trimming, repainting and resealing occur later. Different standards may treat production flaws differently, so origin and grading consequence must remain separate questions.

Is the feature original to manufacture?
Does the governing standard still penalise it?
Is the origin uncertain enough to require a qualifier?

Identify the grade-limiting defect

Ask what prevents the next higher grade. A bright comic may have one decisive subscription crease; a sharp card may have a surface indentation; a fine book may be missing a plate; a clean coin may show improper cleaning.

Which defect imposes a hard ceiling?
Is it severe, disqualifying or merely one of several cumulative flaws?
Would removing that defect change the grade boundary?

Apply thresholds rather than impressions

Use the defined or established limits of the grading convention: permitted wear, maximum defect extent, centring tolerance, structural soundness, colour loss, completeness, restoration rules and qualifier triggers.

Has the evidence crossed the lower-grade threshold?
What rule permits or prevents the candidate grade?
Is the scale clearly named and category-appropriate?

Assess total condition without averaging away danger

A limiting defect may control the result, but the whole object still matters. Several minor flaws, visual balance, strength of unaffected areas and overall freshness can influence a borderline judgement where the standard allows it.

Do cumulative flaws justify a lower result?
Are you allowing strong eye appeal to conceal a serious defect?
Are you allowing one trivial flaw to erase otherwise relevant strength?

Use qualifiers and non-standard outcomes when needed

The evidence may support restored, altered, qualified, incomplete, details, apparent, authentic-only, component-level or specialist-review outcomes rather than an ordinary grade. Forcing an object into a simple number can hide the issue that matters most.

Does restoration or alteration change the grading route?
Should packaging, contents or components receive separate grades?
Is 'insufficient evidence' more defensible than a confident guess?

State the conclusion with an evidence summary

Record the grade, the standard, the principal supporting observations, the limiting defect, any alteration or completeness qualification, the examination limitations and an appropriate confidence level.

Could another collector follow the reasoning?
Does the wording distinguish observed absence from non-detection?
Will the record still make sense after memory has faded?

Condition axes prevent front-face grading

Complex collectibles rarely reduce well to one undifferentiated impression. Condition axes force the examiner to inspect the parts of the object most likely to be overlooked and make it easier to separate overall presentation from completeness, structure and intervention.

Surface and finish

Scratches, abrasions, gloss or lustre, staining, print quality, paint loss, residue, polishing and altered texture.

Often important for: Cards, coins, toys, ceramics, painted objects

Edges, corners and high points

Rubbing, rounding, chipping, dents, edge loss, compression and handling wear at vulnerable extremities.

Often important for: Cards, books, boxes, posters, packaging

Structure and stability

Hinges, joints, bindings, laminates, seams, brittleness, warping, cracks, loose parts and active deterioration.

Often important for: Books, games, figures, furniture, mixed-material objects

Colour and optical presentation

Fading, discolouration, toning, registration, contrast, gloss, translucency and local colour change.

Often important for: Printed paper, plastics, textiles, coins, painted surfaces

Completeness

Original components present, missing, replaced, reproduction, concealed or not verified.

Often important for: Games, boxed sets, toys, books, technical objects

Originality and intervention

Cleaning, pressing, trimming, recolouring, repair, restoration, replacement, refinishing, resealing and conservation treatment.

Often important for: All categories where intervention changes meaning

Function

Movement, soundness, operation, corrosion, mechanism response and whether testing would itself create risk.

Often important for: Watches, electronics, toys, instruments, mechanical objects

Packaging and associated material

Box, card back, window, seals, labels, instructions, inserts, dust jacket, slipcase and documents assessed separately where appropriate.

Often important for: Boxed toys, games, books, records, consumer products

Normal variation or warning sign?

Manufacture and later condition must be separated, but that separation is not always obvious. A feature can be original to production and still limit the highest grade. Another feature may imitate production while actually revealing replacement, cleaning or alteration.

Normal variation

A feature consistent with production

Rough cutting, weak strike, mould seam, print line, assembly mark or original issue fold may be normal for the object or variant.

Normal does not always mean grade-neutral. Some systems still limit top grades for production flaws, but the feature should not be misdescribed as later damage.

Warning sign

A feature inconsistent with known manufacture

Finish mismatch, tool marks, unexpected fluorescence, altered dimensions, incompatible hardware, fibre disturbance or local surface differences may indicate replacement, cleaning or restoration.

When the origin affects value or grade materially, uncertainty should trigger more evidence or specialist review rather than confident classification.

The grade-limiting defect

Many grades are not determined by the average appearance of the object. One consequential defect can impose a hard ceiling even when most features are exceptional. The disciplined question is: what evidence prevents the next higher grade?

Category

Trading card

Strengths

Sharp corners, strong colour and clean reverse

Controlling evidence

A shallow surface indentation visible under oblique light

Prevents the mint-level claim even though the card presents strongly

Category

Comic

Strengths

Bright cover, good gloss and complete interior

Controlling evidence

A colour-breaking subscription crease

Creates a hard ceiling under many comic conventions

Category

Boxed toy

Strengths

Excellent paint, clean window and attractive box

Controlling evidence

One replacement accessory

Requires originality or completeness qualification rather than an unqualified high grade

Category

Coin

Strengths

Strong remaining detail and appealing colour

Controlling evidence

Parallel hairlines and disturbed reflectivity consistent with improper cleaning

May move the result from a normal numerical grade to a details outcome

Category

Book

Strengths

Fine binding and clean boards

Controlling evidence

One missing plate

Completeness becomes controlling despite strong surviving condition

Do not turn 'limiting defect' into 'worst defect always wins'

Some standards use hard ceilings for certain defects. Others consider cumulative condition, overall strength and eye appeal within a permitted range. Evidence-based grading avoids both averaging away a serious defect and reducing a complex object to one trivial imperfection without reference to the actual standard.

Negative evidence and honest uncertainty

Collectors often confuse evidence that something is absent with failure to detect it. A numbered contents list showing twelve components when only eleven are present is positive evidence of incompleteness. 'No restoration was visible in the supplied photographs' is not evidence that restoration is absent.

Supported absence

'The checklist specifies twelve components; eleven are present.'

The record positively supports incompleteness.

Non-detection

'No restoration was identified within the limits of the examination.'

The wording preserves the inspection limit instead of converting non-detection into certainty.

High confidence

Broad access and a clear standard

An unrestricted in-person examination, appropriate light and magnification, inspected components and no significant ambiguity can support a relatively firm conclusion.

All material areas inspected
Relevant standard defined
No unresolved alteration concern

Moderate confidence

Useful evidence with limited uncertainty

Good physical or photographic access may still leave concealed areas, borderline thresholds or uncertainty about whether a feature is production-related.

Minor concealed areas
Borderline grade boundary
Some interpretive uncertainty

Low confidence

Material limitations remain

Limited photographs, reflective or opaque packaging, suspected restoration, uncertain completeness, unfamiliar variants or structural concerns should produce a provisional range or specialist threshold rather than false precision.

Photograph-based estimate
Possible hidden intervention
Insufficient category expertise

Appropriate uncertainty language includes provisional grade, estimated grade, apparent condition, photograph-based assessment, grade range, specialist review required and cannot be determined from available evidence. A low-confidence conclusion can still be useful when it is honestly labelled.

Photographs as evidence, not decoration

Photographs can document

Visible location, extent and change

Images can preserve front and reverse condition, component presence, packaging, labels, close-up defects, treatment stages and changes during ownership.

Front, back, sides, edges and corners
Close-ups of controlling defects
Oblique-light views for surface disturbance
Scale reference where size matters
Neutral, unfiltered colour

Photographs may conceal

Texture, structure and inaccessible areas

Images may miss hairlines, shallow impressions, brittleness, odour, internal incompleteness, structural weakness, subtle restoration and defects outside the focal plane. Colour, contrast, gloss and proportions may also be distorted.

Do not treat a flattering gallery as complete inspection
Qualify remote grades explicitly
Ask for evidence, not reassurance

Remote buying: ask for observable facts

'Is it near mint?' invites the seller to repeat a conclusion. Better questions ask for evidence that can support or challenge the claim.

Are there any creases, impressions or surface indentations?
Can you provide oblique-light photographs and clear images of every corner and edge?
Are the photographs of the exact item being sold?
Is every original component present, and have any parts been replaced?
Has the object been cleaned, pressed, polished, recoloured, repaired or resealed?
Is there damage beneath labels, flaps, mounts or packaging?
Are there odours, brittleness, active corrosion or loose structural elements?
Which grading scale or category convention is being used?

Eye appeal and judgement

Evidence-based does not mean completely objective. A tear can be measured, a part counted and a seal observed as broken, but graders still judge severity, visual impact, threshold placement and whether one defect outweighs otherwise exceptional preservation. The goal is not to remove judgement. It is to constrain judgement with evidence.

The disciplined order

Identify the physical evidence.
Establish the technically supportable grade range.
Consider eye appeal only where the standard allows judgement within that range.

Eye appeal may refine an evidence-based judgement. It should not erase restoration, missing components, cleaning or structural damage.

Bias control: protect the inspection from the story

Collectors are not neutral instruments. The best defence is not confidence but process: inspect before reading the claimed grade, record neutral observations, examine every axis and make the grade answer upward and downward questions.

Anchoring

The first grade heard becomes the reference point

Seller grade, auction estimate or previous certification can shape later observation. Record neutral condition evidence before reading the claimed grade where practical.

Ownership and purchase-price bias

The object feels as though it should justify the decision

Collectors often grade their own expensive purchases more generously. A written observation sheet creates distance between ownership satisfaction and condition judgement.

Rarity and authority bias

Scarcity or reputation is mistaken for condition

A unique object can be historically important and physically poor. A famous seller can still use a different standard or overlook a defect.

Halo effect

One attractive feature controls the whole impression

Strong colour, a beautiful front, sharp signature or impressive provenance can distract from restoration, hidden structure, reverse damage or missing components.

Confirmation bias

Only evidence supporting the hoped-for grade is noticed

The defence is procedural: inspect all axes, ask what prevents the next grade, and record evidence that argues both upward and downward.

Outcome bias

A high sale price is treated as proof of correct grading

Price reflects demand, scarcity, venue, timing, provenance and confidence as well as grade. Market outcome cannot retrospectively prove physical condition.

A practical blind-grading habit

Where practical, complete the observation sheet before viewing the seller's grade, asking price, auction estimate, previous certification or population rank. This will not eliminate bias, but it makes later influence easier to recognise.

Restoration, conservation and alteration

Grading must distinguish present appearance from material history. Restoration may add, replace or visually reintegrate material. Conservation usually prioritises stability and preservation, though appearance may also improve. Alteration changes the object without necessarily fitting accepted conservation or restoration practice.

Restoration

Colour touch, piece infill, replacement pages, repainting, rebuilt corners, resealing, replacement labels or refinishing.

Conservation

Stabilisation, structural support, controlled cleaning or treatment intended primarily to preserve the object.

Alteration

Trimming, polishing, artificial ageing, chemical brightening, surface smoothing, part swapping or seal recreation.

Questions the grading record should answer

What material is original?
What has been added, removed, replaced or treated?
How was the intervention detected or documented?
How does the governing grading system classify it?
Does an ordinary grade remain valid, or is a restored, altered, details or qualified outcome required?

Completeness and component-level grading

Completeness and condition are related but not identical. An incomplete item may contain exceptional surviving parts; a complete item may be heavily worn. Multi-component objects often need more than one overall grade because packaging, contents, documents, accessories and originality can diverge sharply.

Element	Assessment	Evidence note
Box	Very Good	Sound structure, moderate edge wear and one tide mark
Contents	Near Fine	Clean and lightly handled
Rulebook	Good	Complete, with writing and spine wear
Completeness	Complete	All listed components present
Originality	Qualified	Two replacement counters disclosed

This component-level record is more informative than 'overall 8/10' because it preserves the strengths, weaknesses and originality qualification separately.

Certification, grader notes and population data

Third-party certification is strong external evidence that a service examined the object and assigned a grade at a particular time. A holder and certification record may also protect the link between object and label. They do not prove universal agreement, unchanged standards, absence of concealed deterioration or that every attribute important to the collector was captured.

Certification

Evidence of an external judgement

Inspect the object, holder, label, certification record, visible defects and signs of tampering rather than treating the label as the object.

Grader notes

Evidence transparency

Notes can identify principal defects, location, restoration and reasons for qualification, but may not be a complete inventory of every minute feature.

Population data

Context, not proof

Population reports can inform rarity within grade and market context, but resubmissions, selection bias, changing practice and low submission counts limit what they prove about one object.

Repeatability and reproducibility

Repeatability asks whether the same grader would reach a similar conclusion again under comparable conditions. Reproducibility asks whether another competent grader applying the same standard to the same evidence would reach a comparable result. Perfect agreement is unrealistic, but disagreement should arise around threshold interpretation and weighting, not because one examiner ignored the reverse, missed a component or used an undefined scale.

What a reproducible record makes possible

A later review can identify whether the object changed or the judgement changed.
Two graders can discuss the same evidence instead of defending unexplained impressions.
Borderline decisions can be compared consistently across a collection.
Disputes can focus on severity, origin or threshold rather than missing information.

A practical grading record

Documentation should be proportionate. A routine duplicate may require a short evidence note. A rare, restored, insured, disputed or high-value object needs a stronger record because the consequence of error is greater.

Identification

Object name or title
Maker or publisher
Edition, issue or variant
Date, serial or certification number
Dimensions and materials

Examination scope

In person or photographic
Raw, framed, sealed or encapsulated
Accessible and inaccessible areas
Lighting, magnification and tools
Examination date

Condition evidence

Location
Defect or feature type
Size or extent
Severity and visibility
Likely origin
Stability
Image reference

Completeness and originality

Present components
Missing components
Replacements or reproductions
Unverified concealed contents
Cleaning, repair, restoration or alteration

Grade reasoning

Governing scale
Candidate grade
Adjacent higher grade
Evidence preventing the higher grade
Qualifier or details outcome
Confidence level

Model conclusion

A defensible grading statement

Neighbouring domain

Provenance records ownership, custody and historical association. It can support context without proving every component is original or every condition claim is correct.

Collector rule

Use provenance as contextual evidence, not as permission to ignore inspection.

The specialist threshold

Evidence-based grading includes knowing when the available evidence, access or expertise is inadequate. Escalation is not failure. It is the point at which a collector protects the object and the credibility of the conclusion.

Stop self-grading and seek specialist advice when:

Authenticity or exact identification is uncertain.
Concealed restoration, cleaning or alteration would materially affect grade or value.
Safe inspection requires opening, disassembly, removal from a mount or handling beyond your competence.
Rare materials, unfamiliar production methods or disputed variants are involved.
Evidence conflicts or the controlling defect cannot be classified reliably.
Active corrosion, mould, instability, brittleness or structural failure is present.
The grade boundary has a major financial, insurance, legal or dispute consequence.
The object falls outside the collector's category expertise.

A valid final outcome

Insufficient evidence to assign a defensible grade.

This is stronger than a precise-looking number that conceals uncertainty, inaccessible areas or a lack of expertise.

The deeper principle

Evidence-based grading is not an attempt to make every collectible perfectly scientific. Standards are category-dependent, historically contingent and partly judgement-based. Its purpose is more practical: to make the grade answerable to the object.

A credible grade should survive these questions

What did you observe?
Where is the defect and how severe is it?
What evidence indicates alteration, restoration or replacement?
Which grading standard applies?
Why is the object not one grade higher?
What remains unexamined?
Could another competent person follow the reasoning?

Key takeaways

A grade is a conclusion drawn from evidence, not evidence in itself.
Observation, interpretation, application of the standard and final grade should remain distinct.
Direct, repeatable physical evidence normally outweighs testimony, reputation, price and market language.
The governing grading scale and the examination limitations must be declared.
The most consequential defect may set a hard ceiling, but cumulative condition and permitted eye appeal still matter.
Non-detection is not proof of absence; uncertainty should be stated rather than converted into certainty.
The evidence standard should rise with the financial, preservation, insurance or dispute consequence of the grade.
Sometimes the strongest evidence-based conclusion is that the available evidence is insufficient for a defensible grade.

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Consistency and Repeatability

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