What use are computational models of cognitive processes?

Computational modellers are not always explicit about their motivations for constructing mod- els, nor are they always explicit about the theoretical implications of their models once con- structed. Perhaps in part due to this, models have been criticised as “black-box” exercises which can play little or no role in scientific explanation. This paper argues that models are useful, and that the motivations for constructing computational models can be made clear by considering the roles that tautologies can play in the development of explanatory theories. From this, additionally, I propose that although there are diverse benefits of model building, only one class of benefits — those which relate to explanation — can provide justification for the activity.