When Should You Use Personality or Reasoning Tests?
Personality and reasoning tests are powerful tools for making better people decisions. But just like any tool, they’re most effective when used at the right time and in the right way.
Personality tests help us understand how someone typically thinks, feels, and behaves. They reveal preferences, motivations, and interpersonal styles.
Reasoning tests, on the other hand, measure how well a person can learn, solve problems, or think logically under pressure.
Knowing when to use which one can improve your hiring accuracy, reduce turnover, and help employees thrive in their roles. Whether you’re building a team, identifying talent, or developing leaders, these tools can support you, but only if used wisely.
Let’s break down the differences, explore best-use scenarios, and help you avoid common mistakes.
Understanding the Purpose of Each Test Type
To know when to use these tests, we first need to understand what each test measures and why it matters.
What Personality Tests Measure
Personality assessments are not about right or wrong answers. They explore patterns of thinking, feeling, and behaving that tend to remain stable over time. They give insights into:
- Work style preferences (independent vs. team-oriented)
- Energy and motivation levels
- Approach to risk, pressure or uncertainty
- Preferred ways of communicating
- Decision-making tendencies
This helps you understand how someone might fit within a team or organisation culture. They can also flag areas for coaching or development.
For example, a highly independent thinker may need support when working in a collaborative team. Or a detail-oriented person may thrive in a role that requires accuracy and structure.
What Reasoning Tests Measure
Reasoning tests, sometimes called cognitive ability or aptitude tests, assess how someone processes information, solves problems, and learns.
They often focus on:
- Verbal reasoning – understanding written information
- Numerical reasoning – working with numbers and data
- Abstract reasoning – recognising patterns and logic
Reasoning tests are strong predictors of job performance, especially in complex roles where learning quickly and solving unfamiliar problems is key.
But unlike personality tests, they’re timed and have right or wrong answers. They measure potential, not preference.
The Best Time to Use Personality Tests
Personality tests offer value beyond selection, they help create a deeper understanding of team fit, leadership potential and communication styles.
Hiring for Culture Fit and Team Dynamics
One of the best uses of personality tests is during hiring to assess how a candidate might align with your company values and team culture.
Imagine hiring a people manager who scores low on interpersonal sensitivity. That might be a red flag if the role requires empathy and diplomacy. Alternatively, a creative risk-taker may be perfect for an innovation role but disruptive in a rule-bound environment.
Used correctly, personality insights help balance your hiring decision, not replace it. They allow for thoughtful interviews and probing questions around how someone works.
Coaching and Development Planning
Personality assessments shine in development settings. They offer a language for discussing strengths, blind spots and personal growth.
Used post-hire, they can:
- Inform individual development plans
- Support new manager transitions
- Help identify future leaders
- Build self-awareness and emotional intelligence
They are especially helpful during times of role change or stretch assignments.
Managing Conflict or Communication Styles
If a team is struggling with communication or collaboration, personality insights can be a neutral starting point for conversations.
For example, if two colleagues approach problems very differently, one methodical, one spontaneous, a personality profile can help each see the other’s point of view. This builds tolerance and respect in diverse teams.
When to Use Reasoning Tests
Reasoning tests are most useful when job performance relies on the ability to think quickly, learn fast, or solve new problems.
Screening for Problem-Solving and Learning Speed
In early hiring stages, reasoning tests help predict a candidate’s ability to grasp new concepts or manage complexity.
This is especially useful in roles that involve:
- Data analysis
- Systems thinking
- Technical problem-solving
- Rapid upskilling
It’s a fair way to assess aptitude, especially when candidates have different educational or work backgrounds.
Identifying High Potentials in Graduate or Entry Roles
For graduate and early-career hires, past experience is often limited. Here, reasoning tests give a clearer view of potential.
They help you find individuals who may not have the perfect CV but show strong mental agility and learning ability. These are often the people who grow quickly in your organisation.
Roles Requiring High Accuracy and Logic
Certain roles, like finance, IT, or legal, demand a high level of logical reasoning, accuracy, and attention to detail. A well-designed reasoning test can highlight candidates who are well-suited for these challenges.
These tests can also help flag areas where training might be needed before onboarding someone into a complex role.
Mistakes to Avoid When Using These Tests
While personality and reasoning tests are powerful, they can be misused.
Using Tests Too Early or in Isolation
Testing should not be your first filter. Using assessments before reviewing a CV or conducting a short phone screen can lead to missing great talent.
Also, never use test results alone to reject a candidate. They are part of a whole-person approach, alongside interviews, references, and job simulations.
Ignoring the Context of the Role or Team
A strong personality in one team might be disruptive in another. High cognitive ability isn’t always needed for routine or repetitive work.
Always interpret test results in the context of the specific role, team culture, and organisation values. Tests should guide your decision, not make it for you.
How to Choose the Right Test for the Right Moment
Knowing when and how to use assessments helps you get the most value from them.
Aligning with Job Competencies
Before using any test, define the key competencies needed in the role. If the job calls for collaboration and empathy, lean towards personality assessments. If it requires analytical thinking and quick learning, reasoning tests make more sense.
Use test results to validate what you already know, or to explore areas that need deeper questioning.
If you’re unsure where to start, Talent Select offers expert advice and scientifically validated assessment tools to help organisations choose the right tests for the right roles. Their consultants work with you to match the right tools to your business needs, ensuring reliable and meaningful outcomes.
Validity, Fairness and Candidate Experience
Choose only validated, reliable tests with clear norms. Ensure fairness by giving candidates equal time, support, and instructions.
And don’t forget about candidate experience. Communicate why you’re using a test and how it will be used in the process. This builds trust and transparency.
FAQs
Are personality and reasoning tests legal to use in hiring?
Yes, as long as they are used fairly, consistently, and are relevant to the job.
Can a person fail a personality test?
No. Personality tests don’t have right or wrong answers. They’re used to understand preferences, not to pass or fail.
Should reasoning tests be used for all roles?
Not always. Use them when the job requires problem-solving, learning quickly, or logical thinking.
When should I give the test during hiring?
After initial screening and before final interviews is usually the best time.
Can these tests predict job performance?
Reasoning tests are strong predictors of performance, especially in complex roles. Personality tests predict how someone works, but should always be used with other methods.
Do candidates like taking these tests?
Many do, if they see the relevance and the process is explained well. Respectful use boosts candidate trust and brand image.
Used well, personality and reasoning tests can give hiring and development decisions a powerful edge. They provide insights you won’t get from a CV or interview alone.
But timing and context matter. Know your goals, understand the role, and use these tools as part of a fair, transparent process. The result? Better hires, stronger teams, and more confident people decisions.