The D-N model is the only criticism Hempel to make model. A more complete and not say a bad idea or not. Because, really. The concept of Hempel, is valid in itself, which is a key aspect of the theory is its direct maen.
The only criticism is that Hempel DN model to model. A more complete That's not a bad idea or not. Actually, the concept of Hempel because it is valid in itself, a key issue is the validity of the theory.
The Hempel D-N model is just a criticism to make model integrity, not say bad concept or use. In fact, the concept of Hempel have valid in itself, which is the main is the accuracy of the theory.