A Sketch of the Schaffner Model

Kemeny and Oppenheim believed that if we tried to define a model of reduction that covers scientific change including correction then the problem of reduction would become hopelessly complex (Kemeny and Oppenheim 1956, 13). Despite Kemeny s and Oppenheim s pessimistic outlook, those who worked on reduction in 

1 Excursus Schafl ner s Model and the Replacement/Reduction Distinction 

Schaffner s reduction-replacement model nicely illustrates that there is a fundamental difference between reduction and replacement, and it suffers from the unfortunate consequences the combination of these two issues may have. Here is Schaffner s model  

Tb - the reducing theory/model Tb - the corrected reducing theory/model Tr - the original reduced theory/model Tr - the corrected reduced theory/model 

Reduction in the most general sense occurs if and only if  

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