p082fig02.37 My models begin with behavioral data, since brains are designed to achieve behavioral success.  The text explains how models evolve in stages, through a process of successive refinements, or unlumpings.  These unlumpings together carry out a kind of conceptual evolution, leading to models that can explain and predict ever larger psychological and neurobiological databases.<BR>||  Modelling method and cycle.<BR>Behavioral data -(art of modeling)-> Design principles <- Neural data <-(brain predictions)- Mathematical model and analysis -(behavioral predictions)-> Behavioural data<BR>Operationalizes "proper level of abstraction"<BR>Operationalizes that you cannot "derive a brain" in one step.