The authority for this chapter is RCW 28A.600.390, which authorizes the superintendent of public instruction, the state board for community and technical colleges, and the higher education coordinating board to jointly develop and adopt rules governing RCW 28A.600.300 through 28A.600.380, and 28A.150.260 and 28A.150.290 which authorize the superintendent of public instruction to adopt rules governing basic education allocation moneys. The rules set forth in this chapter have been jointly developed and agreed upon by the three agencies, and adopted and codified in separate chapters of the Washington Administrative Code by each of the three agencies. The rules may be modified only by agreement of all three agencies.