Figure 2. Progressive disclosure. Star’s property sheets, like the rest of the interface, use a principle known as progressive disclosure to avoid overwhelming users with information. Usually, users don’t need to see an object’s properties: they only need to see and perhaps change its assigned style. Users see an object’s properties only upon request. Also, even when a user sets a property sheet to show an object’s properties, as shown here, some information remains hidden until the user asks to see it. For example, there is no need to clutter the property sheet here with boxes for entering numbers for “Other” values of Line Height, Spacing Before Paragraph, or Spacing After Paragraph until the user actually sets the property to “Other.”