Literature Review – Emotional Intelligence and Leadership Effectiveness

Introduction

Since Salovey and Mayer (1990) first defined emotional intelligence (EI) as the capacity to perceive, use, understand and regulate emotion, the construct has moved from the margins of psychology to the centre of leadership research. The popular claim, advanced most influentially by Goleman (1995), that EI matters more than cognitive ability for effective leadership now underpins selection tools, executive coaching and leadership-development curricula in Australian organisations. Yet its foundations remain contested: three decades of research have produced rival definitions, competing measures, meta-analyses that disagree about effect sizes, and a persistent argument about whether EI explains anything established constructs do not.

This review synthesises the organisational-behaviour and applied-psychology literature on emotional intelligence and leadership effectiveness. It clarifies how EI is conceptualised and measured, evaluates the evidence linking EI to leadership behaviour and to team and follower outcomes, and identifies what remains unresolved, particularly the construct-validity debates that divide the field. Throughout, it is oriented towards leadership development in Australian workplaces, where bodies such as the Australian HR Institute (AHRI) and the Australian Psychological Society (APS) shape how these ideas reach practice.

The literature was identified through structured searches of Scopus, PsycINFO and Business Source Complete, combining the terms “emotional intelligence”, “leadership”, “transformational leadership”, “team performance” and “incremental validity”. Priority was given to peer-reviewed empirical studies and meta-analyses published between 1990 and 2024, with foundational conceptual works retained regardless of date and Australian organisational studies retained where relevant to the local setting. The reference lists of key meta-analyses were hand-searched for additional primary studies. Figure 1 maps the thematic structure that organises the review.

Conceptualising Emotional Intelligence: Ability, Mixed and Trait Models

A persistent source of confusion is that “emotional intelligence” names at least three distinct constructs. The ability model, developed by Salovey and Mayer (1990), treats EI as a form of intelligence: a set of cognitive-emotional abilities assessed with maximum-performance tests scored against consensus or expert criteria. On this view EI sits alongside cognitive ability and is measured by what a person can do, not by what they believe about themselves.

The mixed model, associated with Goleman (1995), defines EI far more broadly as a portfolio of competencies, dispositions and self-perceptions, including motivation, optimism and self-confidence, held to predict success at work and in life. Trait EI, the third stream, locates emotional self-perceptions within the personality hierarchy and measures them through self-report. Ashkanasy and Daus (2005) offered the three-stream taxonomy the field still uses: Stream 1 is ability EI assessed by performance tests, Stream 2 is self- and peer-report measures based on the ability model, and Stream 3 is the broader mixed and trait models. This is not pedantic: because the streams are measured differently and correlate only modestly, findings for one need not hold for another, and much apparent inconsistency in the leadership literature dissolves once the measurement stream is specified.

Emotional Intelligence and Transformational Leadership

The dominant theoretical bridge runs through transformational leadership, the paradigm in which leaders raise followers’ motivation and performance by articulating an inspiring vision, offering individualised consideration and providing intellectual stimulation. Emotionally intelligent leaders are theorised to enact these behaviours more readily, since perceiving and regulating emotion is central to inspiring, empathising with and persuading others. The most cited quantitative test is the meta-analysis by Harms and Credé (2010), which pooled 62 independent samples and reported a substantial overall association between EI and transformational leadership. Crucially, the corrected correlation fell markedly, from the high to the low range, once studies that drew the EI and leadership ratings from different sources were separated from those relying on a single common source. This same-source inflation recurs throughout the field.

Later syntheses moderate rather than overturn the relationship. Miao, Humphrey and Qian (2016) found that leader EI was positively associated with followers’ job satisfaction and affective organisational commitment, and that transformational behaviour partially mediated these effects, indicating that EI operates partly by shaping the leadership style a manager adopts. The overall contribution is genuine but modest, and strongest when EI and its outcomes are measured independently rather than drawn from a single source.

Team and Follower Outcomes

Beyond the leader’s individual style, EI has been studied as a driver of the relational and collective outcomes on which leadership effectiveness ultimately depends. At the dyadic level, Wong and Law (2002), using their self-report Wong and Law Emotional Intelligence Scale, found that a leader’s EI was positively related to followers’ job satisfaction and extra-role performance, while followers’ own EI predicted their task performance. This established EI as relevant to both sides of the leader-follower relationship.

At the team level, Australian research has been prominent. Jordan and Troth (2004) studied teams undertaking a problem-solving task and found that teams whose members scored higher on EI achieved better problem-solving performance and were more likely to resolve conflict through collaborative, integrative means rather than avoidance. This is consistent with emotional contagion, through which the regulation of emotion shapes the mood and cooperative norms of the group. Follower outcomes such as trust, engagement and organisational citizenship behaviour recur across this literature, consistent with the moderate positive associations reported meta-analytically (Miao, Humphrey & Qian 2016).

Measurement Controversies and Incremental Validity

The central scientific question is not whether EI correlates with valued outcomes, but whether it adds explanatory power beyond cognitive ability and the Big Five personality traits, the constructs it is most often accused of duplicating. This problem of incremental validity is where the field is most divided. Framed through the lens of the psychological sciences, in which the Australian Psychological Society and the wider discipline hold any new individual-difference measure to established standards of reliability and construct validity, the sceptical case is simple: mixed-model EI measures correlate so highly with personality that they may be old wine in new bottles.

The evidence is genuinely mixed and depends heavily on the measurement stream. Joseph and Newman (2010) developed a cascading model in which the components of ability EI predict performance in sequence, and found that ability EI predicted performance most strongly in jobs high in emotional labour, while mixed-model measures owed much of their predictive power to the personality and cognitive-ability content embedded within them. Côté and Miners (2006) reported a compensatory interaction in which the association between ability EI and both task performance and citizenship behaviour was stronger for employees lower in cognitive intelligence, suggesting that EI can partly substitute for it. In the most comprehensive test, O’Boyle et al. (2011) meta-analysed 43 studies and concluded that all three streams demonstrated incremental validity over cognitive ability and the Big Five.

The critics remain unpersuaded. Antonakis, Ashkanasy and Dasborough (2009) argued that the case for EI in leadership had been overstated, that effect sizes shrink under methodological control, and that the construct is too often measured with instruments confounded by personality and rater bias. Their critique, notable for coming partly from within the Australian EI research community, insists that enthusiasm has outrun evidence and that the burden of proof lies with advocates to show unique predictive value under multi-source designs.

Context and Culture as Moderators

A maturing literature has shifted from asking whether EI predicts leadership effectiveness to when and for whom it does. The most robust moderator is the emotional labour of the role: Joseph and Newman (2010) showed that EI predicts performance chiefly in jobs with heavy emotional demands, such as service, care, negotiation or team leadership, and little where emotional content is low. This reconciles inconsistent findings, since EI should matter most where managing one’s own and others’ emotions is part of the work.

Culture is a second moderator with direct relevance to Australian practice. Display rules, the norms governing the expression of emotion, and expectations of leaders differ across national and organisational cultures, so the behavioural expression of EI that followers reward in one setting may not transfer to another. Because much of the primary evidence originates in North American and East Asian samples, its generalisability to the culturally diverse, high-immigration Australian workforce cannot be assumed. Jordan and Troth (2004) provide some local anchoring, but context, both the emotional demands of the role and the cultural setting in which leadership is enacted, conditions the size and even the direction of EI effects.

Developing Emotional Intelligence: Training and Interventions

If EI contributes to leadership effectiveness, can it be developed, or is it a stable trait? The answer again depends on the stream: ability EI, conceived as an intelligence, should be relatively stable, whereas emotional competencies and self-perceptions may be more malleable. The meta-analytic evidence is cautiously encouraging. Mattingly and Kraiger (2019) synthesised controlled training studies and found that EI can be increased through structured intervention, with a moderate average effect across ability and mixed measures, although the durability of the gains and their transfer to on-the-job leadership behaviour were less well established. For Australian practice, this supports including EI-focused components in development programs while cautioning against inflated promises: short-term gains in emotional skills do not automatically translate into sustained improvements in leadership effectiveness.

Synthesis and Research Gaps

Table 1 consolidates the principal studies reviewed above. Together they describe a construct that is real and modestly useful rather than transformative, with the strongest associations where EI is measured by ability tests and outcomes are rated independently, and effects that attenuate without disappearing under methodological control.

Table 1: Summary of key studies on emotional intelligence and leadership effectiveness, 2002-2016

Three interlocking gaps stand out. The first is the unresolved construct-validity debate: the field still lacks consensus on what EI is, and the continued use of mixed-model measures that overlap with personality keeps alive the charge that EI repackages established constructs (Antonakis, Ashkanasy & Dasborough 2009; Joseph & Newman 2010). Until studies routinely report incremental validity over both cognitive ability and the Big Five, using independent measurement sources, effect sizes will remain hard to interpret. The second is methodological: cross-sectional, same-source designs still dominate, and Harms and Credé (2010) show how sharply they inflate the EI-leadership association, while longitudinal, multi-source and experimental designs remain scarce. The third is contextual: Australian evidence beyond a handful of studies is thin, with little research on how EI operates in the culturally diverse workplaces, hybrid teams and public-sector settings that characterise contemporary Australian employment.

Implications for Australian Leadership Development

For Australian organisations, the evidence supports a measured rather than an evangelical approach to EI. Managers make up a substantial share of the workforce, with roughly 1.6 million Australians, around one in eight employed people, in managerial occupations (ABS 2024), so even modest gains in the emotional competence of leaders have wide reach. The AHRI capability expectations for people-management professionals emphasise the interpersonal and relational skills EI describes (AHRI 2023), and EI-based tools are already embedded in Australian selection and development practice. The literature justifies this interest but qualifies it in three ways.

First, selection and assessment should favour ability-based or well-validated measures over popular mixed-model instruments whose scores overlap heavily with personality, and should not treat a single self-report score as a decisive indicator of leadership potential. Second, EI is best positioned as one component within a broader leadership-development architecture, complementing rather than displacing cognitive, technical and ethical capabilities. Third, development programs should set realistic expectations consistent with the training evidence (Mattingly & Kraiger 2019), emphasising sustained practice, multi-source feedback and application to the emotionally demanding situations, such as leading change and managing conflict, where EI is most likely to matter. Framed this way, EI is a useful but bounded contributor to Australian leadership effectiveness, not a substitute for the other capabilities that effective leadership requires.

Conclusion

The relationship between emotional intelligence and leadership effectiveness is genuine but more modest and more conditional than early enthusiasm suggested. EI, especially when measured as an ability and assessed independently of its outcomes, is consistently associated with transformational leadership behaviour and positive follower and team outcomes, and appears developable within limits. Yet it remains contested: rival models measure different things, mixed-model instruments overlap with personality, and the strongest reported effects owe much to same-source measurement. For Australian leadership development, the balanced conclusion is to retain EI as one evidence-based element of leader selection and growth, to prefer rigorous measures, and to invest in the multi-source, longitudinal and locally grounded research the field still needs.

References

Antonakis, J., Ashkanasy, N.M. & Dasborough, M.T. 2009, ‘Does leadership need emotional intelligence?’, The Leadership Quarterly, vol. 20, no. 2, pp. 247-261.

Ashkanasy, N.M. & Daus, C.S. 2005, ‘Rumors of the death of emotional intelligence in organizational behavior are vastly exaggerated’, Journal of Organizational Behavior, vol. 26, no. 4, pp. 441-452.

Australian Bureau of Statistics (ABS) 2024, Labour Force, Australia, Detailed, ABS, Canberra.

Australian HR Institute (AHRI) 2023, The AHRI Capability Framework, Australian HR Institute, Melbourne.

Côté, S. & Miners, C.T.H. 2006, ‘Emotional intelligence, cognitive intelligence, and job performance’, Administrative Science Quarterly, vol. 51, no. 1, pp. 1-28.

Goleman, D. 1995, Emotional Intelligence: Why It Can Matter More Than IQ, Bantam Books, New York.

Harms, P.D. & Credé, M. 2010, ‘Emotional intelligence and transformational and transactional leadership: a meta-analysis’, Journal of Leadership and Organizational Studies, vol. 17, no. 1, pp. 5-17.

Jordan, P.J. & Troth, A.C. 2004, ‘Managing emotions during team problem solving: emotional intelligence and conflict resolution’, Human Performance, vol. 17, no. 2, pp. 195-218.

Joseph, D.L. & Newman, D.A. 2010, ‘Emotional intelligence: an integrative meta-analysis and cascading model’, Journal of Applied Psychology, vol. 95, no. 1, pp. 54-78.

Mattingly, V. & Kraiger, K. 2019, ‘Can emotional intelligence be trained? A meta-analytical investigation’, Human Resource Management Review, vol. 29, no. 2, pp. 140-155.

Miao, C., Humphrey, R.H. & Qian, S. 2016, ‘Leader emotional intelligence and subordinate job satisfaction: a meta-analysis of main, mediator, and moderator effects’, Personality and Individual Differences, vol. 102, pp. 13-24.

O’Boyle, E.H., Humphrey, R.H., Pollack, J.M., Hawver, T.H. & Story, P.A. 2011, ‘The relation between emotional intelligence and job performance: a meta-analysis’, Journal of Organizational Behavior, vol. 32, no. 5, pp. 788-818.

Salovey, P. & Mayer, J.D. 1990, ‘Emotional intelligence’, Imagination, Cognition and Personality, vol. 9, no. 3, pp. 185-211.

Wong, C.S. & Law, K.S. 2002, ‘The effects of leader and follower emotional intelligence on performance and attitude: an exploratory study’, The Leadership Quarterly, vol. 13, no. 3, pp. 243-274.