This is the point where you take control over the level of effort you apply to particular acts. The Will focuses the subconscious force of instincts, assigns it and then transmits it into conscious effort. Much like the gears for your car's transmission, the will controls the amount of available power you use at different times. Commitment is the highest level, causing you to focus energy on assigned tasks. Attempt is the second level, where you try to accomplish a goal, but you don't use your full capabilities.
Intention is the third level, which implies minimal effort.
The levels are clearly defined in the example where people intend to call you, attempt to call you, or commit to a time to call you. Each of us has control over the Level of Effort we give to an activity that engages our instincts. It's up to each individual to make the commitment to do something, or delegate the task to someone else. You have to make choices because there is a limit to your instinctive energy or fuel. At this stage, reason steps in to play an important role.