Humacity is not a new idea. It is a new name for something the research community has been documenting for thirty years. This page organises what the evidence says — and maps it to the five pillars of the Humac Score.
Every study cited on this page exists in isolation. McKinsey publishes on talent. Gallup publishes on engagement. SHRM publishes on turnover cost. None of them connect to a single number a board can act on. The Humac Score is the format that connects them — five pillars, one weighted output, one position on the Humac Spectrum.
Six bodies of evidence — each one a brick in the foundation of Humacity, and a direct input into one of the five Humac Score pillars.
McKinsey's 2023 Performance Through People study is the most comprehensive examination of the link between human capital investment and financial performance ever conducted. Across 1,800 companies in 15 countries over a decade, the data is unambiguous: organisations that develop their people at the highest level while maintaining financial discipline outperform peers on every financial metric that matters. Revenue growth. Margin resilience. Total shareholder return. Attrition rates.
The Value Ledger (L1) and Human P&L (L4) pillars of the Humac Score are built directly on this evidence. L1 captures return per rupee of people investment. L4 captures HR's net profit contribution. The McKinsey data is not cited here as inspiration — it is the validation for why those two pillars carry 45% of the Humac Score's total weight.
Gallup has been measuring employee engagement since 2000. The most recent global data shows that only 21% of employees worldwide are engaged at work. The economic cost of the remaining 79% is estimated at $8.8 trillion annually — 9% of global GDP. At the business unit level, top-quartile engagement units achieve 23% higher profitability versus bottom-quartile units.
This is why Org Vitals (L3) carries the largest weight in the Humac Score at 30%. It is the pillar that captures what Gallup has been quantifying globally — but applied to a single organisation, through 25 signals across six categories: Leadership Pulse, Fear Index, Middle Layer Health, Execution Fidelity, HR Mirror, and Peer & Recognition Culture. The HCI layer further adjusts for macroeconomic and sector conditions that affect what engagement numbers are achievable at any given time.
The research on manager quality is among the most replicated in organisational science. The 2023 Chicago Booth study quantified this in commercial terms: replacing a poor manager with a strong one is the equivalent of adding a fifth employee to a team of four. The 2024–2025 Gallup data makes this more urgent — global manager engagement has fallen nine percentage points since 2022. The drop in 2024 alone cost the world economy an estimated $438 billion.
Middle Layer Health is one of the six Org Vitals categories precisely because this evidence is so definitive. It is not a cultural observation. It is the most financially consequential management decision most organisations make and never track. When the middle layer decays — when managers avoid difficult conversations, when experienced people protect territory rather than develop their teams — the transmission belt between leadership and execution corrodes.
The true cost of a wrong hire ranges from 30% of first-year salary (US Department of Labor) to 200% for senior executive roles (SHRM). LinkedIn's 2023 research found that 85% of HR professionals report a single bad hire negatively impacts the morale and productivity of the surrounding team. The cost is not contained to the individual — it diffuses through the organisation.
The Talent Premium (L2) captures whether the people in an organisation are generating above-average returns relative to their cost. The Human Balance Sheet (L5) is where the cumulative effect of hiring decisions shows up — as talent equity on the asset side, and as flight risk and skill debt on the liability side. Together, L2 and L5 answer the question the SHRM research raises but never answers for a single organisation: what is the actual cost of our talent decisions, and what is the net position?