 Players line up in T formation then shift to a box formation.The Notre Dame Box differed from the traditional single-wing formation in that the line was balanced and the halfback who normally played the "wing" in the single-wing was brought in more tightly, with the option of shifting out to the wing.These two changes made the backs' formation resemble a square (hence "box") and made the formation less predictable, allowing offenses to run more easily to the "weak" side.