140 peer-reviewed studies. One index.
Every statement in the Thrive index traces back to published research. Nothing is invented. Nothing is vibes. Read the full methodology — or any single citation.
Three foundations under
every score.
Rigour has to be demonstrable, not assumed. We're transparent about exactly where the index comes from and how it was built — because a measurement instrument is only as credible as its method.
four labour markets.
The full 55-item instrument was fielded across four labour markets on one harmonised instrument — nearly 6,000 working adults, quota-balanced on age, gender, region, industry and job level. Factor structure, reliability and discriminant validity were verified across all four. The instrument isn't just thought through. It's calibrated.
published threshold, in every one of the eight.
Domain-level internal consistency sits well above the published threshold for organisational research, in every one of the eight domains. That means the statements inside each domain are genuinely measuring the same underlying construct. Your scores aren’t noise.
across the full instrument.
Every statement maps to at least one, usually several, published papers — cited in the full Framework Documentation available to every client. No proprietary black boxes, no made-up constructs. You can trace any score back to the science that produced it.
The scientists who define these fields.
Not the people who write about them.
Every statement maps to published research from named scientists working at the frontier of sleep, stress physiology, exercise science, attention, and the psychology of workplace demands. This is the shortlist — the full reference list runs to 140+ papers.
Center for Human Sleep Science
Sleep & Circadian Institute
Division of Sleep Medicine
Regulatory Biology
Burnout research lead
Nobel Laureate, telomere biology
Stress physiology
Allostatic load
Psychological safety
Organisational psychology
Progress principle
Meaning & identity
"A measurement instrument is only as credible as its method. Publish the method. Cite the sources. Hold the statements to peer-reviewed standards. Everything else is marketing."
How we know the instrument
measures what it claims.
Four methods run in parallel before every version of the Thrive Index is released. Two statistical, two physiological. Any statement that fails on any of them is cut.
Factor structure & construct validity.
Exploratory and confirmatory factor analysis across the full 55-statement battery, replicated in independent validation samples. We confirm that the eight hypothesised domains actually emerge from the response data — not from our expectations. Capacity and engagement correlate at no higher than r = 0.77 — below the 0.85 discriminant-validity threshold, confirming they are distinct constructs.
Test-retest reliability.
Repeated measurement at two-week and eight-week intervals in a stable cohort. Scores should be consistent where conditions are stable, and responsive where conditions change. Both are tested explicitly.
Physiological correspondence.
Self-reported Capacity scores are correlated with objective markers in a sub-sample: HRV, cortisol rhythm, actigraphy-derived sleep metrics, and reaction-time cognitive batteries. The self-report doesn't just feel accurate — it tracks what the body is actually doing.
Predictive power.
We validate that Thrive scores predict operational outcomes — retention, absence, safety incidents, performance ratings — with enough lead time to be actionable. Predictive horizon is reported for every outcome, not buried in an appendix.
We didn't invent
the links. We made
them measurable.
Every domain the Thrive Index measures — sleep, stress, purpose, autonomy, belonging, recovery, cognition, engagement — sits on decades of peer-reviewed evidence connecting it to behavioural and physiological outcomes. What we added is the instrument: a single, validated, 10-minute survey that captures all eight at the scale of an organisation, in one language, without a biometric draw.
Developmental, not definitive.
The four-market validation study (n = 5,922) was run to a standard psychometric protocol — testing whether our statements measure what we say they measure, consistently, across languages and cohorts. It is the psychometric floor under the instrument.
The 18-month physiological pilot was small-scale, internal, and not designed for publication. Its job was to tell us which statement-to-biomarker pairings were worth preregistering at scale — and which were not. It did.
Not peer-reviewed. Not the headline.
We do not present the foundation work as proof of organisational outcomes. It is the reason we are confident enough to run a preregistered, externally-audited study at proper scale — which is what the next section is.
The literature is the ceiling. The preregistration is the bridge. Everything we claim publicly sits on one of those two.
From what people say
to what their bodies show.
The foundation work told us the instrument is sound and the pairings are plausible. The next step is to prove them — externally, at scale, under a protocol locked in before we collect a single data point. A 12-month, three-wave study validating the Thrive Index against wearables, physiological markers, and cognitive testing, with 33 directional hypotheses lodged publicly on ClinicalTrials.gov and OSF before the first participant joined.
longitudinal cohort
Where the self-report
meets the physiology.
The protocol tests 33 pre-registered hypotheses across six categories of objective measurement. Specific construct-level pairings, effect sizes and confidence intervals are held under the pre-registration and will be reported in the Wave 3 publication in Q1 2028. What follows is the measurement scope — not the results.
Activity & movement
Wearable-derived step count, active-minutes and movement patterns. Garmin, WHOOP and Oura feeds, harmonised to a common protocol.
Sleep & recovery
Actigraphy-derived sleep duration and continuity. 24-hour heart-rate variability as an index of autonomic recovery.
Stress & HPA axis
Diurnal cortisol slope from four-point saliva sampling. Standard protocol, published method.
Inflammation & metabolic
Blood-drawn hs-CRP and fasting glucose. Indicators of systemic inflammatory load and metabolic regulation.
Cognition & brain health
Stroop and n-back performance; BDNF as a peripheral marker of neural plasticity. Validated clinical instruments throughout.
Performance outcome
Supervisor- and peer-rated 360° performance at Wave 3, blind to Wave 1 Thrive Index scores. The behavioural endpoint.
A sampling of the reference list.
Twelve foundational papers out of 140+. The full Framework Documentation — including every cited reference, the domain mapping, statement-level rationale and scoring methodology — is shared with every client under NDA.
The Framework
Documentation.
Every citation. Every statement-level rationale. Every scoring rule and quadrant weighting. Shared under NDA with every client — and with you, on request, before you commit.
Nothing invented. Nothing vibes. Every item, every threshold, every decision rule has a citation attached.— The Thrive methodology