What is simulation?
Simulation is the use of a computer model that imitates how a real system behaves over time. The model encodes how often customers or orders arrive, how long each step takes, and which resources each step needs. It also encodes what happens when those resources are busy. Running the model shows queues, waiting times, utilization, and throughput without disturbing the real operation.
Discrete-event simulation, the most common business type, follows individual patients, orders, or trucks through a process. Monte Carlo simulation samples uncertain inputs many times to estimate a range of outcomes. A digital twin is a simulation kept current with live data from the system it represents. Scenario planning often runs each scenario through a simulation model.
Simulation in practice
A regional hospital wants shorter waits in its emergency department without hiring more staff. The team builds a simulation from a year of arrival times, triage levels, and treatment durations taken from the electronic health record. Before testing any change, the team confirms that the model reproduces last winter’s actual waiting times. It then tests a fast track for minor injuries, an extra evening nurse shift, and earlier inpatient discharges. The model shows that most of the delay comes from admitted patients waiting for beds upstairs. The most effective change is therefore earlier discharge planning on the inpatient floors.