Handling of System Events

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      As always, introduce what the section will cover.
      In numbered subsections (i.e. 4.3.1 - 4.3.X) describe your system events. for each system event that you handle, do the following:

• Describe the event, its significance, and how you handle it. The description of how you handle it should be detailed. Don't rely on method names to describe what the methods do. You should describe why each is called.
• Describe when the event happens. Cross reference it to the requirements, Use Cases, etc.
• Illustrate using Collaboration- / Sequence- / State Transition- diagrams as appropriate. (All scenarios should be represented. Not just the main-success-scenario.)

Common Pitfall: When adding parameters to the messages sent between objects, be sure to account for where the parameter values come from. Usual places are instance variables, global data, or passed as a parameter to the call that caused this call. If the diagram does not make this clear, the description should.

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