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GENERAL INTELLIGENCE ASSESSMENT
See who'll perform before you hire them

Predict performance, reduce risk, and personalise onboarding with data on how candidates think, learn, and solve problems, before they join your team. The Thomas General Intelligence Assessment (GIA) gives you the cognitive insight to make smarter, faster hiring decisions from the start.

With the Thomas GIA, you can:

  • Identify top performers early with objective data on learning agility and cognitive ability — not just experience.
  • Reduce mis-hires and early attrition by predicting who will adapt, keep up, and succeed in role.
  • Accelerate onboarding by tailoring development to each person's preferred learning style.

And, the results are designed to be interpreted and acted on directly by hiring managers — no psychometric expertise required.

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Used by 10,000 businesses globally | ISO-certified | Backed by over 40 years of psychometric research.

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What is the General Intelligence Assessment (GIA)?

The Thomas GIA measures fluid intelligence, which is the part of your IQ that defines how quickly you can learn, adapt, and succeed in a role. It goes beyond what CVs and interviews can show, giving you objective, predictive data on cognitive potential before you make your offer.

Delivered through the Thomas Assess platform, it takes just 45 minutes and generates instant, visual results your hiring managers can act on straight away. No specialist training required.

 

It evaluates five cognitive signals that directly impact workplace performance:

  • Reasoning — logical decision-making under pressure
  • Perceptual speed — attention to detail and learning agility
  • Number speed and accuracy — comfort and confidence working with data
  • Word meaning — verbal reasoning and ability to understand instructions
  • Spatial visualisation — abstract thinking and structuring complex ideas

Combine it with the Behaviour, Personality, and Emotional Intelligence assessments in Thomas Assess for a complete view of each candidate's potential.

Aptitude-information

Why cognitive data
changes the hiring equation. 

 

CVs show what someone has done. Interviews show how well they tell their story. But neither tells you how quickly they learn, how they think under pressure, or whether they can keep pace with a fast-moving role. That's the data GIA gives you — turning cognitive potential into a hiring advantage before you make your offer.

80%

of employee turnover stems from bad hiring decisions.

30%

of an employee’s first-year salary — that’s what a bad hire can cost your business.

14%

that’s how much unstructured interviews actually predict future performance.

How it works

When you're hiring at scale, speed and confidence make all the difference. Thomas GIA gives your team fast, predictive insight in a simple, intuitive format, without adding extra steps or complexity.

Here’s how it works:

  • Choose your assessment. Use GIA alone, or combined with the Behaviour, Personality, or Emotional Intelligence assessments for a complete candidate view.
  • Invite candidates directly from Thomas Assess or through your ATS integration.
  • Candidates complete the assessment in 45 minutes, fully online, on any device, no setup or installs needed.
  • Review instant, visual results with clear, unbiased data on each person's strengths, gaps, and potential.

Assessments are just the start

GIA insight doesn't stop at the hire decision. The cognitive data you gather shapes how you onboard, develop, and get the best from your people over time.

With Thomas, you connect aptitude data across the full employee lifecycle — from recruitment through onboarding, development, and succession planning.

  • Build onboarding plans around each person's learning speed and cognitive strengths
  • Set role-specific development goals using objective cognitive data
  • Compare candidates and employees against your own high-performance benchmarks
  • Identify and fill skill gaps across teams with confidence

That way, hiring decisions don't just fill a seat, but build long-term capability across your organisation.

Aptitude-Format

Built on science. Easy to use.

 

The GIA is a well-established psychometric tool backed by over 40 years of cognitive research. Thomas assessments are independently audited by the British Psychological Society, ISO-certified, and regularly reviewed for reliability, fairness, and predictive accuracy by internal psychometricians and external experts.


You get four decades of validated science in a format any hiring manager or HR team can use without specialist support.

Frequently asked questions

 

It measures five cognitive abilities — reasoning, perceptual speed, number accuracy, word meaning, and spatial visualisation — to predict learning speed and problem-solving under pressure.

Just 45 minutes. It's delivered fully online, with results available instantly.

By giving you objective data on how candidates think, learn, and process information — insight that interviews simply can't provide. Whether you're hiring for a customer-facing role or a complex technical position, GIA helps you identify who has the cognitive potential to succeed, not just who interviews well. For organisations hiring at volume, it significantly reduces the time spent progressing candidates who look strong on paper but aren't the right fit.

It's valuable for most roles, but particularly useful where adaptability, learning agility, and cognitive demands are high — including senior leadership, sales, tech, customer success, and operations.

Yes. The platform is designed for manager usability, with built-in guidance to interpret scores and apply insights. For organisations that need professional psychometric accreditation, Thomas Assess Accredited is also available.

Absolutely. The GIA is backed by over 40 years of cognitive research and independently validated by the British Psychological Society for fairness, reliability, and predictive power.

Yes, and we'd encourage it. Thomas makes it straightforward to pair aptitude insights with the Behaviour, Personality and Emotional Intelligence assessments in platform.

Make your next hire your best hire

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