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.

Example of using Pulse function to create a recurring delay.

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.