General Intelligence Assessment

Thomas International Ltd

Summary of Test Review

General description of Test

The GIA is comprised of a series of test that measures key concepts of intelligence and aims to provide an indication of an individuals’ competence in acquiring new knowledge and skills, which is termed their ‘trainability’. The GIA aims to be usable across occupational settings to recruit those with higher levels of GIA as suited to the role, to understand individual differences and challenge high performers, to develop by identifying those who will respond best to development, and to identify the speed at which employees will grasp new tasks and therefore tailor expectations and goals. The foundations of the test are drawn from Detterman’s (1986) approach to intelligence and Carroll’s (1980) eight cognitive tasks paradigm.  The test is available in a number of different languages and norms are based on one large UK occupational group.  

Five computer-based tests are administered online in one sitting, taking around 30-45 minutes to complete. Scores on the subtests are combined to provide an overall measure, the General Trainability Index (GTI). 

The five sub-tests are:

•‘Reasoning’: a test of verbal deductive reasoning and working memory

•‘Perceptual speed’: a letter-matching task that measures how quickly and accurately test-takers can carry out simple visual checking tasks

•‘Number speed and accuracy’: a test to measure how quickly and accurately test-takers can carry out basic number tasks

•‘Word meaning’: an ‘odd-one-out’ style test of vocabulary understanding 

•‘Spatial visualisation’: a test to measure how quickly and accurately test-takers can visualise and rotate shapes

The GIA utilises programmed item-generation whereby test items are generated in real-time, which enables a large number of different but parallel forms of the test to be created. Test items are balanced across tests to ensure that each test-taker is exposed to approximately the same number of items of each level of difficulty. Test takers are instructed to aim for both speed and accuracy. They are encouraged first to read a booklet of example items to familiarize themselves with the testing procedure, and each online subtest is preceded by practice questions. 


Authors of Original Test

Dr Peter Dan

Date of Original Review

Date of Publication of Current Review / Edition


Test Type

General Ability

Numerical Ability

Perceptual speed

Ability Spatial/visual

Verbal Ability

Main Area of Use

Advice, guidance and career choice


Work and Occupational

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