The Big Five is the place to start for any serious attempt at personality assessment in hiring. It's the most well-researched personality framework in psychology, and it gives you a genuinely useful map of how people differ in ways that matter at work.
But it's a starting framework, not a complete hiring tool.
There are plenty of traits the Big Five doesn't cover that matter a lot in the workplace. We'll get into those, and how you can measure all of them in one assessment.
The Big Five personality traits and what they predict at work
The Big Five, sometimes shortened to OCEAN, covers five broad personality dimensions: Openness to experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Each one is a spectrum, not a category. Candidates don't fall into boxes; they sit somewhere along a continuous scale for each trait, and most people are somewhere in the middle on most of them.
That's worth mentioning because it's different from how a lot of popular personality tools work. If you've used Myers-Briggs or similar type-based frameworks, you'll be used to outputs like "INTJ" or "ENFP" that put people into discrete personality types. The Big Five doesn't do that. What you get instead is a profile across five dimensions, which is more accurate, more flexible, and far better supported by the research.
How well does personality actually predict job performance? Honestly, moderately, and it depends heavily on which trait you're measuring and what the role demands.
Conscientiousness and industriousness are not the same thing
Conscientiousness is consistently the strongest personality predictor of job performance, and it generalises across roles in a way most other traits don't. But the overall score can mask two quite different candidate profiles.
Conscientiousness is actually made up of two fairly distinct components: orderliness (the preference for structure, tidiness, and routine) and industriousness (drive, ambition, and the tendency to work hard even when it's uncomfortable). Industriousness correlates positively with general mental ability. Orderliness doesn't. So a high conscientiousness score from someone who craves structure and routine looks very different from one driven by ambition and hard work, and in most high-performance roles, you'd much rather have the latter.
For roles where drive and intellectual ambition matter, measuring industriousness as a distinct facet will give you a much more useful picture than reading off the top-level conscientiousness score alone.
The three traits whose value depends entirely on the role
Extraversion, agreeableness, and openness are all real and meaningful dimensions of personality. But unlike conscientiousness, none of them predict performance reliably across the board. Their usefulness in hiring depends almost entirely on what the role actually demands.
Extraversion is often an asset in customer-facing, leadership, or sales roles. In analytical or solo-focused work, it's much less relevant, and pushing for highly extraverted candidates might actually work against you. Agreeableness can be genuinely predictive in roles that require trust-building or collaboration, but in roles that demand difficult conversations or hard negotiating, very high agreeableness can be a liability. Openness to experience reflects intellectual curiosity and comfort with ambiguity, which tends to matter more in creative or entrepreneurial contexts than in structured, process-heavy ones.
The common mistake isn't measuring these traits. It's treating them as universally good or bad rather than asking whether they fit what the role actually demands.
Neuroticism predicts performance, but resilience predicts recovery
Low neuroticism, sometimes framed as emotional stability, is associated with better performance in high-pressure roles. But emotional stability and active resilience aren't the same thing, and conflating them leaves a real gap in what you're measuring.
Emotional stability describes how reactive someone tends to be. Resilience describes how well they recover after setbacks and whether they can maintain performance through sustained difficulty. Someone can be relatively emotionally stable and still struggle to bounce back from a significant setback. And someone with moderate neuroticism might have developed strong enough coping strategies that they're functionally more resilient than their score would suggest.
In most cases, what you actually care about isn't just "how reactive is this person" but "how do they respond when things go wrong?" Measuring resilience as a separate construct gives you a much more precise answer to that question.
Integrity fills the gap that agreeableness and conscientiousness leave open
High conscientiousness tells you someone is likely to be organised and hardworking. High agreeableness tells you they're likely to be cooperative and warm. Neither tells you whether someone will follow rules when no one's enforcing them, or handle workplace resources and responsibilities appropriately.
Integrity predicts those things, and in particular it predicts counterproductive work behaviours that rarely surface in interviews but cost organisations a significant amount over time. Its value comes from combining it with the other traits, not from treating it as a standalone greenlight.
How Test Partnership's TPAQ-45 goes further
The TPAQ-45 (Test Partnership Adaptive Questionnaire) is built on the Big Five as its foundation, so you get the core OCEAN dimensions that decades of research have validated. The 45 refers to the total number of traits measured, which gives you a sense of how much further it goes beyond the standard model.
That includes industriousness measured separately from conscientiousness, resilience as its own construct rather than something inferred from neuroticism, and integrity as a discrete scale that maps onto real-world workplace behaviours. The distinction between orderliness and industriousness is built into the scoring. You don't have to dig for it.
The TPAQ-45 is also designed with candidate experience in mind, which matters more than it might seem. Poorly designed personality questionnaires are easy to see through and reasonably easy to game. The TPAQ-45 is informed by Test Partnership's business psychologists, who work directly with clients to make sure the output is genuinely interpretable and practically useful.
Conclusion and next steps
The Big Five gives you the right starting point for personality assessment in hiring. The research behind it is solid, and the five broad dimensions do capture real and meaningful differences between people.
The limitation is that the standard OCEAN model was built to describe human personality broadly, not to answer who will perform well in a specific role. Conscientiousness is the most useful predictor overall, but it becomes more useful when you can separate out industriousness from orderliness. Extraversion, agreeableness, and openness only mean something when you read them against what the role actually demands. And neuroticism scores leave a gap that a standalone resilience measure fills rather well.
The TPAQ-45 is designed to cover both: the validated Big Five foundation, plus the workplace-specific constructs that give you a more complete picture. If you'd like to see how it works in practice, or talk through how it might fit into your current hiring process, our team can walk you through it.
Ben Schwencke
Chief psychologist at Test Partnership. MSc in Organisational Psychology with over ten years experience in psychometric testing.
