According to test lore, people vary in their knowledge about tests, and this "test-wiseness" affects their performance on these devices. It is believed that test-wise individuals obtain higher scores on ability and aptitude tests, and distort their scores on personality inventories. Several abilities may be involved in test-wiseness on personality inventories. One is the ability to respond to an inventory in a way that is consistent with a prescribed role. Another potentially relevant ability is accuracy in estimating the desirability of personality items.