Vajrayana (Esoteric Buddhism)
Scholarly research concerning Esoteric Buddhism is still in its early stages and has a number of problems that make research difficult:
- Vajrayana Buddhism was influenced by Hinduism, and therefore research must include explore Hinduism as well.
- The scriptures of Vajrayana have not yet been put in any kind of order.
- Ritual must be examined as well, not just doctrine.
Read more about this topic: Superbuddha, History, Indian Buddhism