1. A method of on-line monitoring of the execution by a human operator of procedures for a complex process facility comprising the steps of: storing electric signals representative of step by step procedures for the complex process facility, at least some steps of which require verification of a selected process condition; generating parameter signals representaitve of the real time value of predetermined process parameters; sequentially electrically selecting a step of one of said stored step by step procedures as a current step; electrically processing selected parameter signals to determine the state of the process condition to be varied by a current step which requires verification; generating a visual representation of said current step including a visible textual statemenet of the condition to be verified, a visual indication of the state of the selected process condition to be verified by the current step, and, where the state of the selected condition indicates that it is not verified, a visible textual statement of recommended operator action; providing means for the operator to electrically generate an operator response signal in response to a textural statement of recommended operator action by said visal display of said current step, including providing means for the operator to select between electrically generating an action complete response signal and an override response signal, and electrically sequentially selecting the next step in said stored procedure as the current step in response to said operator response siganl.