Data Items found by Main Routines (A), and determining sequence of behaviour (B).
Adapted from Bainbridge, 1974, Table 1.

A B

Basic Routines find : Sequencer decisions use data about :

Process state a) control error.
b) step change. a) size of control error.
b) step change.
c) time in half-hour.

Action availability a) list of furnaces with power supply cut.
b) furnace chosen for action.
c) size of action to be made. a) list of furnaces with power supply cut.
b) furnace chosen for action.
c) furnaces previously altered.

Stage lists stages furnaces are in now, listed by type. furnace stages now.

Predictions a) for each furnace :
1) next stage.
2) time of change to next stage.
3) power usage change at that time.
b) control state after next power changing event.
c) action to be made after next power changing event. a) predicted events causing :
1) power usage change.
2) correction of control error.
b) future events in this half-hour.
c) control state after next event.
d) need for action after next event.

	A	B
	Basic Routines find :	Sequencer decisions use data about :
Process state	a) control error. b) step change.	a) size of control error. b) step change. c) time in half-hour.
Action availability	a) list of furnaces with power supply cut. b) furnace chosen for action. c) size of action to be made.	a) list of furnaces with power supply cut. b) furnace chosen for action. c) furnaces previously altered.
Stage lists	stages furnaces are in now, listed by type.	furnace stages now.
Predictions	a) for each furnace : 1) next stage. 2) time of change to next stage. 3) power usage change at that time. b) control state after next power changing event. c) action to be made after next power changing event.	a) predicted events causing : 1) power usage change. 2) correction of control error. b) future events in this half-hour. c) control state after next event. d) need for action after next event.