The Thrivability Index.

Human flourishing is among the most important things we can measure. It is also among the least consistently measured.

The science is strong. Decades of cross-cultural research in positive psychology, social determinants of health, organizational science, and behavioral economics converge on a consistent set of dimensions that matter for human wellbeing across populations. The Global Flourishing Study at Harvard and Baylor, with Gallup and the Center for Open Science, is one of the largest longitudinal efforts to measure flourishing at global scale, following more than 200,000 people across 22 countries.

There is no shortage of ways to think about flourishing. The field holds strong frameworks, each built for its own purpose and carrying its own scope and terms. What has been missing is a single, permissively licensed reference that a researcher, an employer, a city, or a health system can pick up and use now across individuals and populations, without negotiating permissions or rebuilding from scratch.

The Thrivability Index is offered as that reference: grounded in the foundational science, structured for use from individuals to populations, and open, because a standard worth having is one anyone can adopt without friction.

The Thrivability Index measures eight pathways of human flourishing. Each pathway meets three design criteria.

Universal necessity. The dimension must be essential to human flourishing across cultures, consistently present across populations rather than correlated with wellbeing in only one. The cross-cultural research in positive psychology, the WHO social determinants framework, and the UN Human Development Index converge on dimensions that appear across the diverse populations studied. A dimension that matters in San Francisco but not in Lagos or Seoul does not belong in the index.

Independent measurability. The dimension must be measurable on its own, without requiring the others. A population can have strong purpose alongside financial instability. An individual can have high physical health and low social wellbeing. This is conceptual and diagnostic independence, not statistical independence, and it is what makes the index diagnostic rather than averaged.

Cross-domain relevance. The dimension must matter at scale, to the institutions and systems shaping human conditions. A measurement that describes only individuals, or only populations, is incomplete.

One rule sits beneath all three. A pathway earns a place only if measuring it does not require deciding whose values are correct. This is why the index includes only what is consistently observed across cultures and leaves out anything contested or value-laden. A standard meant to cross cultures cannot take sides on contested moral content. The restraint is the design.

We chose eight as the smallest set we found that meets all three criteria together. The framework draws on five research traditions: positive psychology, self-determination theory, social determinants of health, organizational health science, and behavioral economics. No single tradition covers all eight. The synthesis is the contribution.

The Thrivability Index does not invent a new account of human flourishing. It takes the shape that decades of research already point to and makes it adoptable. It is worth being plain about the work it stands on.

The Global Flourishing Study at Harvard and Baylor, with Gallup and the Center for Open Science, is following more than 200,000 people across 22 countries and measures six domains of flourishing. Seligman's PERMA model, validated across many countries, sets out five elements of wellbeing. Self-Determination Theory, a widely replicated framework in psychology, identifies autonomy, competence, and relatedness as basic human needs. The WHO frameworks on mental health and social determinants, the UN Human Development Index, Ryff's scales of psychological wellbeing, and Putnam's work on social capital each map part of the same territory, and each was built for its own purpose, whether research, clinical practice, or policy.

These frameworks converge. The dimensions that recur across this body of work are the ground the index is built on. There is substantial convergence on these recurring dimensions, even where the field still debates the exact set. What it has not produced is an agreed, adoptable form. Open measures exist, several of them, and each was built for its own purpose and carries its own scope or license terms. What is missing is a single reference, permissively licensed for use including commercial use, structured to work from individuals to populations, that a researcher, an employer, a city, or a health system can pick up without negotiating permissions or rebuilding from scratch. That gap, a gap of form rather than of insight, is the one the index fills.

Two of the eight deserve a word, because shorter frameworks sometimes set them aside. Personal Growth and Learning earns its place because the capacity to develop and exercise competence is one of the three basic psychological needs in Self-Determination Theory, present across the cultures studied and a distinct predictor of long-term flourishing. Without it, the index cannot describe the part of a life most tied to development, agency, and adaptation, the part most exposed as work and technology change. Community and Environmental Engagement earns its place because close relationships, which the social pathway covers, do not capture how people flourish in groups and in place. Putnam's social capital research ties civic participation to health, economic, and educational outcomes at the population level, and the environmental psychology literature ties connection to nature to wellbeing on its own. Without it, the index cannot describe flourishing at the scale of neighborhoods, cities, and regions, the scale much of it occurs at.

One dimension the index leaves out on purpose deserves a word, because well-regarded flourishing research includes it. The Global Flourishing Study counts character and virtue among its domains, and serious traditions, Aristotelian and religious alike, hold that character sits close to the center of a good life. That is a serious position, and including character is a sound choice for a study setting out to map the whole of human flourishing. The index makes a different choice, for a different purpose. It is built to be a shared standard that any culture, sector, or community can adopt without first agreeing on whose account of virtue is the correct one. Measuring character well means deciding which virtues count, and traditions answer that differently and with good reason. So rather than encode one answer into a standard meant to cross all of them, the index measures the conditions and capacities of a flourishing life, the things observable across cultures, and leaves the question of virtue to the traditions, communities, and individuals who are the right ones to hold it. A reader who believes flourishing is incomplete without virtue is not wrong. They are pointing to a boundary the index draws on purpose, so the standard can stay neutral across the very value systems that give virtue its meaning.

The dimensions are individually grounded in the peer-reviewed literature, cited with each pathway below. The eight-factor index as a whole is entering its validation phase. We are plain about that distinction, and we invite the proving. The full construction and methodology are on the Methodology page.

The Thrivability Index is a framework, a set of definitions, and a shared reference. It is open. Take it, use the eight pathways in your own work, build on it, at no charge, with attribution. The framework belongs to the field.

A single score, on its own, says little. The same score set against comparable populations, and tracked over time, becomes something a community can act on. That comparison is the part Human Thriving Inc. builds and offers, for those who want it, by consent and from aggregated signal only, never from individual responses. The framework itself is yours regardless, at no charge.

To take the index and use it, see the Methodology, which holds the construction, the evidence, the instrument design, and the open package under a CC BY 4.0 license. To see the standard working on a single person, Try It Yourself returns a brief reading of your own shape across the eight pathways.