This chapter discusses ability tests that show surprisingly large correlations with real-life behaviours. Intelligence seems to predict how people behave in a variety of real-life settings. It influences how well children perform at school: although there is some evidence showing that the amount of education that a child of a certain age receives influences g, g itself is a potent predictor of school achievement, even when factors such as social class are controlled. Intelligence also predicts performance at work, both directly, and via its influence on educational qualifications: Gottfredson considers the links between the skills measured by intelligence tests and those that are required in the workplace. Childhood intelligence was significantly related to survival until age 77 in a sample of 2000, the effect being slightly larger for women, probably because higher-IQ men tended to die on active service during Word War II.