Chapters 5 to 13 present discussions of factors in our datasets as classified into a number of fairly broad domains of ability – generally, domains that embrace abilities commonly thought of as belonging under the general concept of intelligence. Many hundreds of token factors identified in the datasets are listed in those chapters. But in any enterprise that attempts to classify a large number of entities there will inevitably remain a residue not easily classified. This chapter deals with those token factors that do not easily fit into the domains previously discussed, or that for some reason defy meaningful classification and interpretation.

Factors discussed in this chapter are not necessarily less important than those dealt with in previous chapters. Some of them concern dimensions of personal characteristics that may not strictly belong under the concept of intelligence or cognitive ability. Others may have to do with cognitive ability, but they have not been widely investigated.

As far as possible, factors presented here are classified into a number of somewhat arbitrary, unrelated domains. But there are other factors that appear only rarely in the datasets, or that appear only in the form of “n-lets” (doublets, triplets) because they relate to highly specific kinds of variance. These are presented mainly in the form of lists, with appropriate discussion. The chapter ends with a list of factors in the datasets that remain uninterpreted; in general, these are regarded as resulting from statistical artifacts.