Primarily intended as a study aid, the text is written in rapid-fire question/answer format. This way, readers receive immediate gratification. Moreover, misleading or confusing 'foils' are not provided. This eliminates the risk of erroneously assimilating an incorrect piece of information that makes a big impression. Questions themselves often contain a 'pearl' intended to reinforce the answer. Additional 'hooks' may be attached to the answer in various forms, including mnemonics, visual imagery, repetition, and humour. Additional information not requested in the question may be included in the answer. Emphasis has been placed on distilling trivia and key facts that are easily overlooked, that are quickly forgotten, and that somehow seem to be needed on board examinations.