In their everyday work, schoolteachers, kindergarten teachers, and also educationalists and psychologists who work in extracurricular institutions are constantly faced with questions and problems in which intelligence is a central aspect. Decisions that have practical implications (such as recommendations on which type of further schooling is appropriate for a student, for example) also depend on the extent to which those responsible are able to grasp, understand and correctly interpret current findings on intelligence. This book explains the concept of intelligence in a way that is understandable for laypersons even without any prior knowledge of psychology. It does not focus purely on diagnosing intelligence, but throws light on many different aspects that are educationally relevant.