[en] An effort is underway to optimize the roles of man and machine in the control of liquid-metal-cooled fast breeder reactors. The work reported here describes: (1) a methodology for the decomposition of a process into a hierarchical structure; (2) an explicit methodology, Sequencing Established States, to limit the state space search for process control; and (3) the Procedure Prompting System which demonstrates the use of the above methodologies for automatically generating instructions to provide guidance to an operator for both normal and off-normal plant conditions