About Optimum Assessment

Stimulate growth

We believe in the power of assessment and certification as the engine for personal and professional growth. With innovative and digital tools, we enable people and organisations to excel by making knowledge and talents transparent and valued.

Our mission

To create the ultimate assessment experience in partnership with our customers, anytime and anywhere.


Partner in digital assessment

We regard our clients as partners with whom we work on a project or structural basis to create the ultimate assessment experience. Optimum Assessment not only devises solutions, we also provide implementation, guidance and support in the field of assessment. Whatever your needs, you can count on us. Indeed, our concrete and practical approach has allowed many clients to excel in the new digital landscape. Together, we take digital assessment to an (even) higher level.

Optimum Assessment - Your Partner in Online Assessment

Logo Optimum Assessment

Optimum Assessment Platform

The Optimum Assessment Platform is worthy of its name. Thanks to state-of-the-art technology, the digital Optimum Assessment Platform is not only safe and reliable, the software is also fully interactive. With 9 advanced modules, you can easily design, host, monitor and analyse tests

Solid partner base

Our robust, reliable and, above all, secure assessment system supports formative, summative and practical testing. This makes Optimum Assessment Platform broadly applicable. For many years, our assessment software has supported large (national) testing systems on the one hand and smaller professional certifications on the other. In addition, Optimum Assessment serves clients in diverse domains such as government, examination institutes, sectors & professional associations, private and funded education. We are proud of our partners and actively invest maintaining a strong relationship. See an overview of our partners here.


Since 1990, Optimum Assessment (until recently Citrus Andriessen) has distinguished itself with excellent technology and high-quality knowledge in the field of digital assessment, examination and certification. As a pioneer in digital assessment, we launched the first SaaS solution on the Dutch assessment market some 30 years ago. A robust, secure and user-friendly testing environment with more than a million users per year. We now support the assessment domain with the modular and highly innovative Optimum Assessment Platform.

Citrus Andriessen

Optimum Assessment is a trade name of Citrus Andriessen. For several decades now, Citrus Andriessen has been an established name in the Dutch world of assessment. The demand for our products and services is now also growing beyond our national borders. Achieving international growth ambitions requires a recognisable and unambiguous international name. From 2023, Citrus Andriessen will therefore continue under the name Optimum Assessment.


Why Optimum Assessment?


Your partner in digital assessment

Excellent service & support


Fully supported assessment, anytime and anywhere

Innovative, user-friendly and secure assessment software


Committed and enthusiastic professionals

Top-class assessment experts & developers



Always the solution that suits you


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