The integrity of the evidence,
not the outcome.
Climate, nature and resilience programmes fail not because the outcomes are weak — but because the evidence behind them collapses. GEFI is the world's first evidence-integrity standard, scoring how likely a programme's evidence is to fail under institutional review, validation or financing.
GEFI does not measure performance. GEFI measures whether the evidence can be trusted.
Integrity Score
Three surfaces: attribute, score, simulate.
Attribution Engine
Turns raw monitoring data from any tool or partner into attributable, reviewer-ready evidence chains.
Open NAE →Failure Index
Scores evidence integrity 0–100 and Class A–F across the six pillars.
Open scoring →Reconstruction Simulator
Simulates how the evidence spine collapses under governance, attribution and partner stress.
Open ERS →Connected by the Bridge Layer — the governed integration spine that closes the loop between the three surfaces. Open the bridge → See the full Evidence Stack →
Six independent pillars compose a 0–100 Evidence Integrity Score.
Attribution Quality
Is every data point attributable and traceable to actor, method, time, place and governance?
Governance Maturity
Is there a functioning governance spine with clear authority boundaries and reviewer routing?
Validation Readiness
Can evidence be validated independently, without reconstruction or partner dependency?
Reconstruction Reliability
Can the full evidence chain be rebuilt at any time, by any reviewer, without loss?
Partner Evidence Fragility
How likely is partner-level evidence to collapse under stress, turnover or operational gaps?
Collapse Probability
What is the probability the programme's evidence spine fails under institutional scrutiny?
Four institutional-grade outputs.
- Evidence Integrity Score — the 0–100 headline measure of robustness.
- Evidence Risk Class (A–F) — A is institutionally robust; F is evidence-collapse likely.
- Evidence Failure Map — structural, functional and stress-based failure modes.
- Evidence Risk Narrative — reviewer-grade strengths, weaknesses and required corrections.
The invisible failure modes.
Most programmes collect data. Few can attribute it. Even fewer can validate it. Almost none can reconstruct it.
Evidence fragility is what blocks institutional financing, independent validation, long-term monitoring, programme scaling and portfolio comparability. GEFI is the first system that measures evidence integrity itself — not the outcomes built on top of it.
Built for institutions that require governed, attributable, reconstructable evidence.
GEFI is the scoring layer on Terra Vita's evidence-integrity architecture.
Governance spine
Authority boundaries, reviewer routing and escalation pathways are inherited from the Terra Vita governance model.
Attribution logic
Actor, method, time, place and governance attribution feed Pillar 1 directly.
Reconstruction architecture
Data lineage and version control underpin Reconstruction Reliability and Validation Readiness.
Reviewer routing
Accredited reviewers are assigned and routed through the Terra Vita Hub.
Evidence Console
Programmes upload governance and evidence materials to the Terra Vita Evidence Console for assessment.
Decision environments
Institutional decision environments convert scores into financing, validation and portfolio decisions.
Three movements: intake, assessment, scorecard.
Intake
The programme submits the Institutional Intake Form; eligibility is screened and a reviewer assigned.
Open the intake form →Assessment
Reviewers score thirty indicators across the structural, functional and stress layers.
Open the scoring sheet →Scorecard
Integrity Score, Risk Class, failure map and narrative are issued at programme level.
View scorecards →GEFI v1 is in structured development.
Pilot assessments begin Q3 2026.
Why Terra Vita: GEFI is only possible because Terra Vita provides a governance spine, attribution logic, reconstruction architecture, evidence failure modes, reviewer routing and institutional decision environments. No other organisation holds this combination.
Request a briefing or participate in the pilot.
t.vanderwalt@terravitaglobal.com Begin a programme assessment → Read the GEFI v1 specification →Global Evidence Risk Map
Every territory is shaded by modelled Evidence Integrity. Select a country for its dossier — score, failure map and reviewer narrative. Illustrative model outputs.
Sector Evidence Benchmarks
Comparative evidence-integrity profiles across nature-based solution methodologies, ranked weakest to strongest. Crediting methodologies differ enormously in how reconstructable their evidence is.
Programme Scorecards
Programme-level evidence integrity and collapse probability. Click a column header to sort.
| Programme | Country | Sector | Class | Score | Collapse probability |
|---|
Score a programme's evidence spine.
Score each of the 30 indicators 0–3 (0 absent · 1 partial · 2 functional · 3 institutionally robust). Pillar scores, the Evidence Integrity Score, Risk Class, failure map and narrative update live.
Turn raw monitoring data into attributable evidence chains.
Any tool, any partner. Select a monitoring source and toggle the attribution metadata captured at source — the evidence chain, completeness and gaps recompute live. Illustrative.
Simulate how evidence collapses — and how to prevent it.
Choose a stress scenario and adjust the chain. The evidence spine, failure propagation, integrity score and collapse probability recompute live. Illustrative.
The governed integration spine: FieldTrace, Hub and GEFI as one evidence loop.
Not a feature — a governance-grade integration layer. FieldTrace produces attributable evidence, the Hub produces governed evidence architecture, GEFI produces evidence-integrity scores, and corrections flow back. Illustrative; operational consoles and evidence records remain protected.
Executes the full FieldTrace → Hub → GEFI → feedback cycle against your Supabase database and returns the records actually created.
The four bridges
Bridge governance rules
Operator console · programme integration status
The bridge operator surface: Hub bundle, FieldTrace and GEFI status per programme, with incidents surfaced first. Reviewer scoring lives in the Scoring sheet → and results in the country dossier →.
Bridge data model
Bridge interfaces · API reference
How GEFI works.
A 0–100 Evidence Integrity Score, built from six pillars of 16.6 each, assessed through three layers, and classified A–F.
The six pillars & their indicators
Three-layer assessment
GEFI evaluates the same six pillars through three lenses to produce a complete evidence-integrity profile.
Evidence Risk Classes
Assessment workflow · intake to classification
1 · Intake & Eligibility
Intake form submission, eligibility screening, acceptance and reviewer assignment.
2 · Evidence Acquisition
Evidence request pack issued; upload to the Terra Vita Evidence Console; completeness check.
3 · Structural Assessment
Do the required structures exist? Structural scores, failure map and narrative.
4 · Functional Assessment
Chain tracing, attribution verification, governance testing, partner sampling.
5 · Stress Assessment
Partner turnover, method deviation, missing metadata, reconstruction under time pressure.
6 · Scoring & Classification
Aggregate structural, functional and stress scores into Integrity Score and Risk Class.
7 · Programme Briefing
Full scorecard, risk narrative, failure map, corrections and strengthening plan.
8 · Publication
With explicit consent: score, class, summary narrative and sector benchmark.
Institutional Intake Form
The minimum governance-grade information required to initiate a GEFI Programme Assessment. Submissions are captured securely. Fields marked * are required.