# SIM: Running a Simulation

Once you have setup your simulation with all the options of your choosing, you are ready to start simulating. There are two ways to run a simulation, automatically or manually. To run a simulation manually, select the Step Size from the first drop-down box on the toolbar . Then use the Step Forward and Step Backward buttons to advance the simulation by the chosen number of events. By default, the next transition to occur is randomly selected from the Eligible Event list. If you wish a specific event to occur next, click on the event in the eligible event list, then click on Step Forward.

To run a simulation automatically, simply push the Run Simulation button on the toolbar. The simulation will run fast or slow depending on if Fast Mode is enabled. If it is not enabled, the simulation will step based on the time delay you have selected in the Dashboard. The simulation will run until you reach your stop condition. If you have no stop condition, your simulation will run indefinitely. If you wish to stop your simulation at any point in time, press the Stop button on the toolbar. A notification will appear indicating the user has stopped the simulation. All the buttons to run a simulation can also be found in the Run menu.

If you have simulated a large number of events but wish to go back to a specific step, it can cause strain to manually click the Step Backward button numerous times. This is why there is another drop-down box on the toolbar. If you know the specific step you wish to navigate to, simply enter it in the drop-down box and click the Go To button on the toolbar.

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