One of the central tenets of the present book is that the memory function develops appropriate subset links automatically: indeed, that this is one of the principal characteristics of human memory. The position is taken here, then, that subset links do form between a header such as “List X” and the items present on that list. But lists of random items are difficult to learn and retain; in other words, the relevant subset links can be understood as being weak. In contrast, the temporal or order structures that generally dominate this form of recall are considerably more effective. In support of the claim of subset links operating for List X, if an individual thoroughly overlearns a list of say 20 items and is then asked whether certain foils or certain real targets were on the list (was “owl” on the list?), it emerges that an answer can be given instantly. In other words, the learner does not have to run down the 20-word sequence to discover whether “owl” was present or not. In this case, subset links appear to have grown strong enough to operate directly.