Evidence of Success. By no later than March 31, 2019, the Joint Oversight Committee must certify that a research base and body of evidence upon which the BPPSLP concept has im- proved professional practices, increased student learn- ing, and increased career acceleration and opportuni- ties as evidenced by increased interval and Pathway movement and Lead Teacher placement. If the Joint Oversight Committee does not so certify, the BPPSLP shall terminate on March 31, 2019, and the then existing pay scale shall be converted into a traditional salary scale based upon steps and lanes with no loss of salary or benefits.