Table 2 Rule-based versus dynamic control

An egg is boiled by reference to a rule; the time known to achieve the desired set. However, this rule is context–dependent; a meaningful change in altitude requires an adjustment in cooking time. In contrast, an egg is fried by use of dynamic control. The cook monitors several sources of information, possibly adjusting the heat to speed or slow the process, and may even generate useful information by shaking the pan. Dynamic control is robust in the face of changes in context.