Upon the commencement of plan operations after the initial approval of a State's plan by the Assistant Secretary, a State has three years in which to complete all of the developmental steps specified in the plan as approved. Section 1953.4 of this chapter sets forth the procedures for the submission and consideration of developmental changes by OSHA. Generally, whenever a State completes a developmental step, it must submit the resulting plan change as a supplement to its plan to OSHA for approval. OSHA's approval of such changes is then published in the Federal Register.