Think of the most successful person you went to school with. There's a decent chance they weren't the one with the highest marks in maths. They may simply have been the one who handed things in on time, kept their promises and kept going when it got boring.
That everyday reliability has a name in personality psychology: conscientiousness. And across decades of research, it has turned out to be one of the most consistent predictors of how life goes, from exam results to careers to health. In some areas it rivals intelligence. Here's what the evidence actually shows, where the headline needs a caveat, and how to build more of it.
What conscientiousness is
Conscientiousness is one of the five broad traits in the Big Five model. It describes how organised, dependable, self-disciplined and goal-directed you tend to be.
People high in conscientiousness usually:
- Plan ahead and keep track of what they've committed to.
- Follow through on tasks, even dull ones.
- Resist distractions and impulses more easily.
- Pay attention to detail and like things done properly.
People lower in the trait tend to be more spontaneous, flexible and relaxed about rules and deadlines. That has its own advantages, but it can make long-term goals harder.
The research: how well does it predict success?
The title promises "almost as well as IQ," so it's worth being precise about where that holds and where it doesn't.
At work
In 1991, Murray Barrick and Michael Mount published an influential meta-analysis showing that conscientiousness was the Big Five trait most consistently linked to job performance across a wide range of occupations. Later large reviews, including the well-known 1998 summary by Frank Schmidt and John Hunter, still found general mental ability to be the strongest single predictor of job performance. Conscientiousness was one of the best additions on top of it.
So at work, IQ generally wins, but conscientiousness is a solid second and largely independent of intelligence. Our post on whether IQ predicts success looks at that side of the story.
In education
This is where the headline holds up best. A 2009 meta-analysis by Arthur Poropat found that, at university level, conscientiousness predicted academic performance about as strongly as intelligence did. At school level, intelligence was the stronger predictor, but conscientiousness still mattered. Turning up, revising and meeting deadlines turn out to count for a lot.
Across life
A 2007 review led by Brent Roberts, titled "The Power of Personality," compared personality traits with socioeconomic background and cognitive ability as predictors of major life outcomes: mortality, divorce and occupational attainment. The authors concluded that personality traits, with conscientiousness prominent among them, predicted these outcomes about as well as the other two factors did.
Conscientious people tend to live longer, partly because they're more likely to look after their health, avoid risky behaviour and stick with medical advice.
From childhood
In New Zealand, the long-running Dunedin study followed about a thousand children from birth. A 2011 paper by Terrie Moffitt and colleagues found that childhood self-control, closely related to conscientiousness, predicted adult health, finances and lower rates of criminal convictions at age 32, even after accounting for intelligence and family background.
A quick summary of the evidence
| Outcome | How conscientiousness compares with IQ |
|---|---|
| Job performance | IQ stronger; conscientiousness a consistent second |
| University grades | Roughly comparable |
| School grades | IQ stronger, conscientiousness still meaningful |
| Health and longevity | Conscientiousness often more relevant |
| Major life outcomes overall | Comparable in some large reviews |
The honest headline: conscientiousness doesn't replace intelligence, but it adds to it, and in some areas it matters about as much.
What about grit?
Grit, popularised by Angela Duckworth as passion and perseverance for long-term goals, drew huge attention in the 2010s. A 2017 meta-analysis by Marcus Credé and colleagues found that grit overlaps heavily with conscientiousness and predicts performance only modestly. In other words, much of what made grit look powerful was conscientiousness under a new name.
Why conscientiousness works
A few ordinary mechanisms explain most of its effects:
- Small actions compound. Doing the reading, saving a little each month and exercising regularly add up over years.
- Reliability builds trust. People who keep their word get given more responsibility and more chances.
- Fewer avoidable mistakes. Attention to detail and planning reduce errors and crises.
- Health habits stick. Sleep, diet and check-ups are easier to maintain with steady self-discipline.
None of these is glamorous, which is partly why the trait is often overlooked.
The downsides of very high conscientiousness
More isn't always better. Extremely high conscientiousness can come with:
- Rigidity. Struggling when plans change or rules don't fit.
- Perfectionism. Setting standards so high that nothing feels finished.
- Overwork. Difficulty switching off or taking rest seriously.
If that sounds familiar, it's worth balancing discipline with flexibility. Our post on perfectionism looks at where high standards become a burden.
Can you become more conscientious?
Yes, within limits. Research on personality across the lifespan finds that conscientiousness tends to rise on average from young adulthood into middle age, as people take on jobs, relationships and responsibilities. Studies of deliberate personality change also suggest that people who set specific behavioural goals can shift their scores modestly over months.
What tends to help:
- Make it concrete. "Exercise more" is vague. "Walk for 20 minutes after lunch on weekdays" is actionable.
- Use your environment. Put the gym bag by the door, block distracting apps, keep a single to-do list.
- Start small. Tiny, reliable wins build the habit of following through.
- Plan for obstacles. "If I'm tired after work, I'll do a ten-minute version instead" keeps the streak alive.
- Be kind about lapses. Procrastination is often about managing difficult feelings, not laziness, as we explain in procrastination and personality.
To find out where you currently sit, and which parts of the trait are strongest for you, take our free Big Five personality test. Knowing whether you score higher on orderliness or on industriousness helps you choose where to focus.
The bottom line
Conscientiousness is the quiet trait behind a lot of success. It doesn't beat intelligence at predicting job performance, but it comes close in education, matches it in some reviews of major life outcomes, and often matters more for health. The good news is that, unlike many advantages, it can be built one small, reliable habit at a time.
FAQ
Is conscientiousness more important than IQ?
It depends on the outcome. IQ is usually the stronger predictor of job performance, while conscientiousness rivals it for university grades and often matters more for health and longevity.
What are the signs of high conscientiousness?
Being organised, keeping promises, planning ahead, following through on dull tasks and resisting distractions are typical signs of high conscientiousness.
Can conscientiousness be learned?
To a degree, yes. It tends to rise naturally with age, and setting concrete goals and building small habits can shift it further over time.
Can you be too conscientious?
Yes. Very high levels can lead to rigidity, perfectionism and overwork, so balancing discipline with flexibility and rest helps.
