Most employee measurement asks one question: how do people feel about work? That captures half of what determines performance. The other half is whether they have anything left to give it — and the two must be measured separately before they can be read together.
The model rests on one distinction. Capacity asks whether people can sustain performance. Engagement asks whether the organisation gives them reason to. Both are necessary; neither is sufficient.
The physiological and cognitive headroom available to do the job well — energy, recovery, focus and resilience. This is the half almost nobody measures.
Whether the organisation creates the conditions for contribution — enablement, leadership, growth and connection. This is the half most surveys already cover.
Each half is scored across four domains, and each domain is built from statement-level responses rather than a single question.
The eight domains roll into two indices, and the two indices into one: the Thrive Index. That single number is what makes tracking and benchmarking possible across teams, sectors and cycles.
But the combined score is only half the output. Plotted against each other rather than summed, capacity and engagement produce four distinct states — thriving, coasting, at risk and depleted — and the same combined score can mean opposite things depending on which state produced it.
The score: the Thrive Index. The diagnosis: the Thrive Matrix.
Because they move independently, and the gap between them is the finding. An engaged, depleted workforce is not a contradiction — it is the most common precursor to burnout, and an engagement survey alone reports it as a success.
In our validation study both halves moved across the Index range, but not identically: capacity from 49.6 to 85.7 (+36) and engagement from 48.0 to 97.5 (+50), across a total Index spread of 48.9 to 90.9. They correlate enough to combine, and diverge enough that combining alone would hide the diagnosis.
What each half measures and where they diverge: capacity vs. engagement.
Read together, the two halves separate organisations sharply on outcomes leaders already track.
Every figure with its comparison basis, and the limits of each: the evidence base.
Both indices, the action plans and the learning that follows sit in a single workforce performance platform.
Figures on this page come from thrive at work’s own validation study (n=10,000+, 2025–26), fielded across the US and Europe. Unless stated otherwise, each comparison is bottom decile versus top decile of the Thrive Index.
These are associations measured within a single cross-sectional study. They show that high-capacity organisations look materially different on outcomes leaders already track; they are not a causal claim that raising a score produces the outcome.
A 30-minute call with the research team covers what a first measurement would surface, and how your sector compares.