Secondly, Sadr put forward that education is not an isolated field, and the development of education is restricted by many external factors.

Thirdly, Saddler warned comparative researchers not to simply copy foreign educational theories, experiences and systems.

Fourthly, Sadr's contribution to the development of comparative education lies in that he expanded the research space of comparative education and expanded the focus of comparative research from Europe and America to India and other colonies of the British Empire on various continents at that time. He also expanded the content of comparative education research to vocational training, amateur education for workers, women's education and other fields that few scholars paid attention to at that time.