It is true that CAT4 tests are standardised against the UK school population. However GL Assessment have always stated that these tests are equally valid for international schools since the diversity of international schools makes it almost impossible to standardise across a wide sample of international schools;. When we consider factors such as curriculum, geography, number of students with English as Additional Language (EAL) it is easy to see why international standardisation is not a straightforward task.
However, GL Assessment have recently confirmed that their UK standardisations, based on a diverse student population in excess of 224,000 students, have proven to be relevant and reliable for many international schools. They have carried out benchmarking exercises to compare the scores achieved by thousands of international students globally against the original standardisations for CAT4.
A detailed comparison of UK standardisations and international scores show that the distribution of international scores for CAT4 Level D is typical for international students and is very similar to the UK standardisation profile overall. Results show that typically international school students tend to score more highly on quantitative, nonverbal and spatial tests, but lower on verbal.
Deputy Head Teaching & Learning,
and School Improvement