 The moniker “DEKI” highlights the account’s key features: denotation, exemplification, keying-up and imputation. DEKI answers the problems from  Section 1  in much the same way as  Representation-As  did. However, it adds to the latter in at least three ways. Firstly, the conditions given make it clear what makes scientific models \(Z\)-representations in the first place: interpretations. Secondly, it makes explicit that the properties exemplified by the model need not be imputed exactly onto the target, and highlights the need to investigate keys specifying the relationship between properties in models and the properties that models actually impute onto their targets. Finally, it makes explicit how to account for targetless models. A scientific model that fails to denote a target system can nevertheless be a \(Z\)-representation. A model of a bridge that is never built is still a bridge-representation, which exemplifies properties related to bridges (stability and so on), despite the fact that it is not a representation of anything. However, as in the case of  Representation-As  questions remain with respect to the problem of ontology and the applicability of mathematics.