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Systems Simulation: Why One Run Proves Nothing

How computer models of real systems are built and trusted: discrete events, random numbers and variates, input data, queues, verification, output analysis and fair comparisons.

Systems Simulation · 50 questions

Try 3 questions

1. In discrete-event simulation, how does the simulation clock usually advance?

  1. In real time, following a wall clock
  2. By jumping to the next scheduled event
  3. In fixed steps of one second each
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Answer: By jumping to the next scheduled event

Nothing changes between events, so the model skips idle time, which is why it can simulate a year in seconds.

2. In a simulation of a bank, customers are entities. What are the tellers?

  1. Resources
  2. Events
  3. Attributes
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Answer: Resources

Entities flow through the system and seize resources, like tellers, which have limited capacity.

3. What does the future event list in a discrete-event simulation contain?

  1. The list of customers already served
  2. Upcoming scheduled events in time order
  3. A log of every event that already happened
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Answer: Upcoming scheduled events in time order

The simulator repeatedly removes the earliest event, executes it and schedules any new events it causes.

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