The ten functions in the Traces are summarized by Chih-i specifically and generally. Summarizing specifically the ten functions with the Four Siddhāntas shows that the ten functions can be divided into four groups and each of these four groups of function corresponds to each of the Four Siddhāntas.

In terms of the functions that can be summarized by the Siddhānta for Each Person, “opening the three and revealing the one”, “abiding in the three and employing the one”, and “converging the three and revealing the one” are said by Chih-i to correspond with the Siddhānta for Each Person. This is because these three functions reveal that the One Buddha-vehicle is contained within the Three Vehicles, and one does not need to abandon the Three Vehicles in order to reach the One Vehicle. Since the Siddhānta for Each Person is to arouse the wholesomeness that is inherently possessed by all beings, and these three functions are also to reveal the One Vehicle that is contained within the Three Vehicles, they correspond with each other. (Vol. 2, Page 449)