A scenario is a schedule option with it's own constraints and inputs. Each project is able to have any number of scenarios attached to it. All scenarios within a project make use of the one main database. For each scenario, you must define the following details:

Most of the items that are assigned to a scenario can be shared amongst different scenarios. For example, the same calendar may be accessed by two different scenarios or the same preschedule table may be used by a number of scenarios. If the information is updated for one scenario, then the updates are immediately accessed by the other scenarios.