Beginners – slow TUT 4-1-2 with anything lower body;squats, lunges, step downs, etc.. Learn form and body control in all planes.
Intermediate – Deceleration to stability phase. progress to low box step off and pause at the bottom of the landing, I do this starting with a 6-12 in box depending on the ability of the client. The drop is only acceptable as a means to train reactivity/eccentrics as long as the client can maintain proper core control. (this is a linear deceleration in any given plane)
Advanced – This deceleration to rebound phase. there is no pause at the bottom of any movement once the movment is decelerated there is an immediate return to the ready position. The progression here is to change direction after recovery then on to external reactivity for direction, such as a trainer standing there with two cones placed 45 degrees on either side of the client, once the client steps off and recovers the trainer immediately blows a whistle and takes a step in a direction of one of the cones and the trainer sprints to that cone. (This is the non-linear phase)
This is a general course of action and to write in detail could be pages of information, many books are written on this subject alone.