That is a good question and it took me years to get a decent answer. For a quick and easy explanation the curriculum is a high-grading of the full PTK system and is intended as relatively quick learn structure compared to the prior more exhaustive curriculums. It was brought about when GT started training the military and needed a vehicle to make recruits functional quickly. It (should) focus on high percentage techniques and fairly gross motor actions. This does not mean it is better than the prior curriculums, just that it was organized to get to certain concepts faster than had been done before. You cannot learn the full system of PTK through only studying the Tri-V curriculum, you need to fully investigate each of the subsystems more fully to do that, those subsystems are captured in prior curriculums such as the Doce Methodos.