Reasons for Media:

Graphics & Video:

• Supplement text

• Create impact
  

Audio:

• Enhance information

• Background music

• Sound effects

• Feedback from clicks

• Give warnings.

Types of Authoring Metaphors:

• Linear - slide show

• Icon Based, event driven - Menu with various choices based on events. Like a flow chart of conditions.

• Time based and presention tools - Timeline for events to occure. Also allow for interactivity.