The fourth phase of the Major Capability Acquisition process. The purpose of the P&D Phase is to produce and deploy requirements-compliant materiel solutions to receiving operating organizations.  In this phase, the product is produced and fielded for use by operational units and encompasses a number of events: Low-Rate Initial Production, personnel training, completion of developmental test and evaluation (if required), Initial Operational Test and Evaluation, and the Full Rate Production Decision or the Full Deployment Decision. All system sustainment and support activities are initiated if not already begun, and the appropriate operational authority will declare Initial Operational Capability when the defined operational organization has been equipped, trained, and determined to be capable of conducting mission operations. “Should cost” management and other techniques will be used to control and reduce cost.