The sūtra classification system of the Lotus Sūtra explains how it differs from other sūtras. This system is called the “three standards of comparison,” which measure the worth of a teaching. The first measure is whether people of all capacities can attain buddhahood through a particular sūtra. The second is whether the process of teaching is revealed in full. The third standard is whether the original relationship between teacher and disciples is revealed. The five periods and eight teachings are treated as exemplifying the first standard of comparison.