The critical message from them is that development is multidisciplinary and that notwithstanding their shortcomings, each of them still captures some aspects, at least, of the challenges of contemporary developing countries.
Developing countries can be categorized into the stages of development proposed by W. W. Rostow but that fact does not guarantee the highest growth rate to any country that mobilizes the most savings and investment. The Lewis model emphasizes structural transformation which admittedly is a challenge to many developing countries.