The findings confirm that hypothesis 1 is true indicating there is a relationship between the effectiveness of a pre-direct method foreign language course book and the proper interpretation of deductive logic of the grammar-translation method as reflected in a pre-direct method foreign language course book. Moreover, the findings suggest a possible link between the effectiveness of the pre-direct method Grammatica ungherese e libro di lettura and the deductive logic of the grammar-translation method as reflected in Grammatica ungherese e libro di lettura, hence, hypothesis 2 also proves to be true. To conclude, the wrong interpretation of deductive logic may be what causes the problematic elements and the assumed ineffectiveness of the grammar-translation method in Grammatica ungherese e libro di lettura.