The ideal that tests (most specifically tests of intelligence ) are free from any bias towards members of one culture rather than another. Many of the well-known intelligence tests (such as the Stanford-Binet and the WISC ) have been criticised for being Anglo-centric (they are biased towards English-speaking peoples). Other tests have been criticised for their bias towards ‘WASP’ (White, Anglo-Saxon, Protestant) American children. It is doubtful whether tests can ever be truly free of culturally acquired knowledge. The majority of such tests measure crystallised intelligence , and as such are measuring skill in a cultural context.