The Exhibit 300 is a format to demonstrate to agency management and OMB a strong business case for the investment and to meet other Administration priorities to define the proposed cost, schedule, and performance goals for the investment if funding approval is obtained. Major investments, as identified by OMB, must be reported in an Exhibit 300.
Following OMB guidance, Exhibit 300s must be posted to the Agency website after the submission of the President's budget request to Congress.