This Insight is a simple model of a sluggish shower, the classic example from Systems Thinking of a balance loop with delay. It illustrates the sometimes baffling influence that time delays can have on simple decision making tasks.

It is a simple model to show how different parameters like inventory adjustment time and delay in ordering affect the inventory replenishment system. User can change values of all the parameters.

This model of a single simple shower is based on a 1994 paper by John Morecroft et al of the London Business School.  It is used to show the impact of delay on control of a simple system.