For both global and regional operation plan development, the process consists of several discrete phases time-phased force and deployment data (TPFDD) that may be conducted sequentially or concurrently, in whole or in part. These phases are concept, plan development, and review. The plan development phase consists of several subphases: forces, logistics, and transportation, with shortfall identification associated with each phase. The plan development phases are collectively referred to as TPFDD refinement. The normal TPFDD refinement process consists of sequentially refining force, logistic (non-unit-related personnel and sustainment), and transportation data to develop a TPFDD file that supports a feasible and adequate overlapping of several refinement phases. The decision is made by the supported commander, unless otherwise directed by the Chairman of the Joint Chiefs of Staff. For global planning, refinement conferences are conducted by the Joint Staff in conjunction with US Transportation Command. TPFDD refinement is conducted in coordination with supported and supporting commanders, Services, the Joint Staff, and other supporting agencies. Commander in Chief, US Transportation Command, will normally host refinement conferences at the request of the Joint Staff or the supported commander.