most commonly used IQ test, developed in 1949, also a version for children, 2 subtests: verbal (general knowledge, language, reasoning, memory skills) and performance (spatial, sequencing, problem solving), test administered by trained examiner, requires complex set of materials, 90 mins to complete, crystallised & fluid intelligence
fluid intelligence

the ability to problem solve and reason 'on the spot' when faced with new problems
raven's progressive matrices

non-verbal IQ test, assesses limited reasoning, multiple choice puzzles, participant asked to identify missing item that completes a pattern, progressively more challenging, measures fluid intelligence only, 3 different tests: adults, children, individuals with moderate or severe learning difficulties and adults with above average IQ, culturally neutral
