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The science behind our assessments

Discover how our tests meet the highest psychometric standards to deliver results you can trust.

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We've helped 6,000+ companies with our assessments and guidance

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Modern psychometrics, not guesswork

Our assessments are developed using Item Response Theory (IRT)—a modern psychometric framework that offers far greater accuracy than older Classical Test Theory (CTT) methods. Rather than simply tallying correct answers, IRT takes question difficulty into account, delivering more meaningful scores and more consistent candidate experiences. This enables a smarter, fairer, and more robust assessment process.

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Faster and Fairer with Computer Adaptive Testing (CAT)

Thanks to IRT, our assessments can be delivered adaptively—getting harder or easier depending on each candidate’s performance. This makes the test experience smoother, more engaging, and far shorter without sacrificing accuracy. Adaptive testing also makes it significantly harder to game the system, as each candidate receives a unique set of questions.

  • Greater precision in less time
  • Customised experience for every candidate
  • Strong protection against cheating
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Measuring using the leading models of personality and cognition

Our assessments are grounded in robust, well-established psychological models—not pop psychology. For example, our personality assessments are built on the Big Five, HEXACO, and Core Self-Evaluations, while our cognitive tools are developed using decades of research in psychometrics and intelligence testing. This ensures your results are interpretable, meaningful, and defensible.

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Fairness at the core

Fairness isn’t an afterthought—it’s engineered into every stage of development. Using Differential Item Functioning (DIF) analysis, we check for and remove bias at the individual question level. This goes far beyond standard adverse impact analysis and ensures our tests remain fair across all protected groups, even as we continue to update and improve them over time.

  • Fair and inclusive by design
  • Bias checked at the item level—not just after the fact
  • Continuously monitored for long-term equity

Your assessment partner, more than just a tool

Have complete confidence in the assessment process with an expert business psychologist on your side

Personalised consultations

Our business psychologists are always on-hand to provide expert guidance tailored to your selection & assessment needs.

Complexity into clarity

We help demystify the science behind psychometric assessments, so you can confidently make data-driven selection decisions.

Instant support

Our dedicated UK support team is always there for you. Fast assistance on everything from candidate support to technical questions.

Trusted by hundreds of organisations to deliver scientifically robust, data-driven assessments.

These are the results you can expect with Test Partnership.

  • 80%

    Reduction in time to hire
  • 92%

    Candidate completion rate
  • 93%

    Candidate satisfaction
What our clients say about working with us

"Great customer and client service, super responsive account managers and tech support. The testing platform is extremely easy to use."

client hr solutions hub
Tim Jackson Director and Principle Advisor, HR Solutions Hub Ltd

"A reliable tool that helps us hire the best talent in the market. It gives us an overall view of the candidate’s performance in real-time."

client helmi talib
Rocel Magtibay Human Resource Director, Helmi Talib Group

"The Test Partnership team are incredibly helpful - and quick to respond (we're talking within minutes!)"

client instant impact
Mollie Cross Talent Partner, Instant Impact

"The site can be personalised, is easy to navigate, and the ability to make your own tests is very beneficial."

client daniel watney
Charlotte Butt HR Lead & Associate Partner, Daniel Watney LLP

Test Partnership has a large library of sophisticated tests that we can implement quickly. The team are great and always on hand with a speedy response.

client bright network
Paul Porter Senior Recruitment Operations Manager, Bright Network

"In the new age of remote workers, and hiring through teams etc. Test Partnership is an excellent tool to evaluate a candidate. Test Partnership is solving the lack of meeting candidates face-to-face."

client logo signagelive
Frank Larsen Chief Commercial Officer, Signagelive

"Test Partnership has have some great software and assessments, but what stands them apart is their desire to help you to achieve your goals."

client fitforwork
Stephen Reilly Talent Director,
Fit for Work

"Test Partnership's assessments have been a great way for us to easily screen and test candidates. It's fast to use and we highly recommend it."

client seedstars
Horatiu Ticau Head of People Operations, Seedstars

"It integrates well with our ATS product meaning scores and reporting are efficient and easy to download. The colleagues at Test Partnership are also easy to get hold of to answer any questions."

client Group GTI
Karl Watson Client Account Director, Group GTI

Trust in the science. Invest in better hiring.

Better hiring starts now. Chat to our experts about your assessment requirements.