An Act amending Title 71 (State Government) of the Pennsylvania Consolidated Statutes, in preliminary provisions, further providing for definitions; in membership, credited service, classes of service, and eligibility for benefits, further providing for credited State service; in contributions, further providing for shared-risk member contributions and shared-gain adjustments to regular member contributions, for contributions to the system by the Commonwealth and other employers and for actuarial cost method and providing for advance payment of accrued liability contributions; in administration, funds, accounts and general provisions, further providing for administrative duties of the board, for duties of heads of departments and for State accumulation account; providing for obligations of the board, for exercise of legislative power and for liability.