For years, intelligence has enjoyed something of a VIP status in the workplace. Going through multiple competitive entrance examinations and aptitude tests to enter educational institutions, followed by the pressure of recruitment processes involving rounds of assessments, group discussions, and interviews, has become standard practice for securing employment today. The test continues with promotion assessments at job. This is because the ability to think quickly, solve problems and score well on cognitive tests has often been treated as a reliable predictor of professional success. But what if the relationship between intelligence and job performance isn't quite as strong as managers have been led to believe? A study involving 212 samples covering 109,396 workers has challenged the idea that test scores are indicative of the pinnacle of workplace performance. These findings provide interesting insights for managers who are responsible for identifying talent, assessing employees and deciding who gets the next promotion.
The numbers tell a different story
In a study titled "Is General Mental Ability Still the Best Predictor of Job Performance? Integrating Contemporary Meta-Analytic Evidence" rather than conducting a new experiment with a handful of employees, the researchers brought together evidence from three contemporary meta-analyses, covering studies conducted between 1990 and 2022. Their combined analysis examined 212 samples involving 109,396 workers, making it a substantial look at how general mental ability (GMA) relates to professional performance.
GMA is a broad psychological measure of a person's ability to learn, reason, process information and tackle unfamiliar problems. In simpler terms, it is the kind of mental ability that conventional intelligence and aptitude tests attempt to measure. For decades, GMA was considered one of the strongest predictors of workplace performance. While earlier research assigned higher values of correlation between GMA and overall job performance, later studies reduced the proportion of this correlation. It does not mean intelligence is irrelevant or that a clever employee will necessarily perform poorly. Rather, it suggests that intelligence test scores have a more modest relationship with actual job performance than older research led employers to believe. A test can tell you something about how readily someone might learn or solve a problem, but it cannot tell you everything about how they will function in a real workplace.
Why being good with people matters, too
The study also raises questions on how exactly job performance is measured. With the evolution of technology and transformations in workplace requirements, different jobs actually demand different skills and capabilities from employees.
The researchers looked at three broad dimensions of occupational activity: Data, People and Things. These categories help distinguish jobs that involve analysing information, interacting with others, and working with physical objects or equipment. And here is where the findings become particularly relevant to modern offices. The researchers found that jobs that are more mentally demanding or involve dealing with people are places where intelligence is not necessarily a strong predictor of performance. Interestingly, intelligence appeared to have a closer connection with performance in jobs that involved more hands-on work, particularly those requiring employees to handle information as well as physical tasks. In other words, being good at thinking is useful, but how well someone puts that ability into practice also depends on the kind of work they do. This challenges the traditional assumption that intelligence tests become especially useful simply because a job is intellectually demanding. Think about a hotel manager, for instance. Understanding occupancy figures, managing budgets and making quick decisions are important parts of the role. But so are calming an unhappy guest, coordinating housekeeping staff, handling an unexpected booking problem and keeping a team motivated during a busy holiday weekend. A brilliant analytical mind is certainly useful, but it cannot single-handedly deliver excellent hospitality. The same applies to a teacher, nurse, journalist or project manager. Knowledge and reasoning matter, but so do communication, judgement, adaptability and the ability to work with people who may not always agree with you. The study also points to a changing nature of work. Modern occupations increasingly involve teamwork, interpersonal responsibilities and collaboration with technology. As artificial intelligence takes over certain routine knowledge-based tasks, human judgement, autonomy and the ability to work alongside AI may become even more important.
