The reference establish the system used to publish all training standards, provide policy, and assign training responsibilities, especially as applied to the System Approach to Training (SAT). ITS establish training standards for all Marines in the same occupation field (OccFld). They are the foundation on which to build training. ITS are identified qualitative training requirements that govern formal school training and provide rationale to establish course of instruction. They are also used by unti commanders to provide training for individual Marines and to design training plans.