A note on the title’s claim

The “twice as accurately as IQ” framing comes from Goleman’s popular writing rather than from a single controlled study, and his broader claims — that EI accounts for 80% of leadership success, or matters twice as much as IQ — exceed what peer-reviewed research strictly supports. The evidence base is substantial but more modest than the popular framing suggests. The article presents what the research actually shows, which is still commercially significant.

What emotional intelligence actually is

The scientific construct was formally developed by John Mayer and Peter Salovey in 1990, before Goleman’s popularisation, as a genuine cognitive ability: the capacity to perceive emotions accurately, use emotional information to facilitate thinking, understand emotional meanings and their progression, and regulate emotions in oneself and others. This four-branch model treats emotional intelligence as a set of measurable skills, not personality traits — and research using the Mayer-Salovey-Caruso Emotional Intelligence Test consistently shows that EI predicts leadership effectiveness above and beyond IQ and standard personality measures.

Goleman’s contribution was applying this construct to leadership through a five-component framework: self-awareness, self-regulation, motivation, empathy, and social skill. His 1998 Harvard Business Review article argued that these competencies distinguish star performers from adequate ones more reliably than IQ or technical skill — a claim that subsequent research has tested at scale.

Why EI predicts performance where IQ does not

IQ measures the capacity of the prefrontal cortex under neutral conditions. Emotional intelligence measures how reliably that capacity is preserved under emotional conditions — which is when most consequential leadership decisions are actually made.

The amygdala processes emotional threats rapidly and automatically, often generating responses that override the prefrontal cortex’s deliberate reasoning. The high-IQ, low-EI leader has the analytical capability but loses access to it under pressure — the amygdala hijack the leadership neuroscience article established. The high-EI leader maintains access to their full cognitive capability precisely when it is most needed. This is why EI outperforms IQ in predicting leadership effectiveness in high-stakes, socially complex environments: not because IQ doesn’t matter, but because EI determines whether IQ remains accessible under the conditions leadership actually operates in.

What the meta-analytic evidence shows

A meta-analysis aggregating findings from 12 studies with 2,764 participants found that leader EI accounted for approximately 25% of variability in team performance — described in the research as a large effect. This holds across cultures and industries. In contrast, IQ alone explains only 4–10% of achievement at work. The ratio between these figures is the most defensible empirical basis for the article’s central claim — EI explaining 25% of performance variance versus IQ explaining 4–10% is a meaningful comparative advantage, and the “twice as accurately” framing is, if anything, an understatement of what this comparison suggests.

TalentSmart’s research found that EI explains 58% of success across all job types, and that 90% of top performers have high emotional intelligence while only 20% of low performers do. These figures come from proprietary research rather than peer-reviewed studies, and should be understood as indicative rather than definitive — but the direction is consistent with the peer-reviewed meta-analytic evidence.

The largest evidence base for the entrepreneurial context specifically is a meta-analysis aggregating findings from more than 65,000 entrepreneurs globally, which found that those higher in EI had measurably better business performance outcomes. This is the most directly relevant finding for this series’ audience, and the sample size makes it more reliable than any single study.

The practical asymmetry: EI develops, IQ largely does not

One of the most practically significant differences between EI and IQ for entrepreneurs is developability. IQ is largely fixed after early development. Emotional intelligence is a flexible competence that can be cultivated through structured practice, feedback, and reflection — and the neuroplasticity research established in previous articles provides the biological mechanism for why this is possible.

Goleman and Cherniss’s Consortium for Research on Emotional Intelligence in Organizations has accumulated substantial data from leadership development interventions showing that EI competencies improve measurably with deliberate practice. The practical implication is direct: telling a founder that their IQ limits their leadership effectiveness offers no actionable pathway. Telling them that their emotional intelligence determines their leadership effectiveness — and is trainable — offers a concrete development agenda.

Where the evidence is most direct

Goleman and Cherniss document a case in their 2024 paper in which a company tested financial advisers on EI, cognitive ability, and personality. The key performance indicator was how many new financial advisers each executive recruited. Those with higher EI recruited more financial advisers, while cognitive ability and personality failed to predict their performance. This is not a laboratory finding but a real commercial context using a hard business metric — and the domain (recruiting and building teams) is precisely the one where EI’s social skills, empathy, and self-regulation are most consequential for entrepreneurs.

What this means for the self-awareness work of this series

The EI competencies Goleman identifies — self-awareness, self-regulation, motivation, empathy, and social skill — are not separate from the psychological work this series has documented throughout. Self-awareness is the capacity to notice one’s own patterns before they run automatically. Self-regulation is the capacity to remain in the prefrontal cortex under pressure rather than amygdala-driven threat response. Empathy is the capacity the power paradox article established is eroded by unchecked authority. Social skill is what psychological safety research shows emerges from vulnerability and high-expectancy leadership.

EI is not a separate competency to develop alongside everything else. It is the integration of what this series has been building toward — the capacity to bring the full cognitive and relational self to the work of leading, under the conditions where doing so is hardest.

A book worth reading alongside this

The Emotionally Intelligent Manager by David Caruso and Peter Salovey is the most scientifically grounded applied treatment of emotional intelligence available and the most directly useful for anyone who wants to work with the construct seriously rather than through the popular framing. Salovey is one of the original scientific discoverers of EI, and this book applies the four-branch MSCEIT model to managerial practice with the rigour that Goleman’s popular writing trades away for accessibility. Caruso and Salovey’s treatment of how to use emotional information strategically — not just manage emotions, but actively use what emotions are communicating as data for better decisions — is the most practically sophisticated account of what high EI leadership actually looks like from the inside. For any entrepreneur who has read Goleman and wants to understand what the construct actually means beyond the popular framing, this is the most direct available upgrade.

“If the experiences described in this article are significantly affecting your wellbeing, relationships, or ability to function, speaking with a psychologist or therapist is the right next step — not a last resort. UK: Samaritans (116 123, free, 24/7). Mind (0300 123 3393). BACP therapist finder: bacp.co.uk/search/Therapists. International: iasp.info/resources/Crisis_Centres. Crisis Text Line — text HOME to 741741 (US, UK, Canada, Ireland).”

Have questions about this article?

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This article is for educational and informational purposes only. Sources: Mayer, J.D. & Salovey, P. (1990), Imagination, Cognition and Personality, 9(3), 185–211. Goleman, D. (1998), Harvard Business Review, 76(6), 93–102. Goleman, D. & Cherniss, C. (2024), Leader to Leader. Côté, S. & Miners, C.T.H. (2006), Administrative Science Quarterly, 51(1), 1–28.