For cognitivists, the initial concentration on psychometric tests was defensible because it connected their efforts to the instruments that for nearly a century had been the basis of serious theoretical and empirical work on intelligence. Tests had become (and still are) the most accepted way of operationalizing intelligence and its quantification as IQ. Also, cognitive tests do predict real-world attainments with moderate success, even though considerable residual variance remains unexplained. The variance in valued outcomes not absorbed by psychometric tests hints that mechanisms other than those captured by IQ tests are at work, and some of these might legitimately be considered aspects of broad-sense intelligence. In the language of this book, the intelligence repertoire is larger than that evoked by IQ tests or quantified in IQ scores.