按部就班

- follow the prescribed order; conform to ancient customs [style]; Creep before you walk.; do sth. according to routine; first things first; follow strictly prescribed routine; go [act] each according to his duties; in accordance with the prescribed; in a proper order; keep to conventional [fixed] ways of doing things; Learn to say before you sing.; observe office routine; perform routine duties; proceed in order; Run before you leap.; step by step; work strictly by [according to] protocol

Theofficials complied according to ranks，with the titled，cabinet ministers and heads of the ministries in front.; The officials of the six bureaus of the palace lined the steps according to rank，the military ones at the west and the civil at the east.