Group Scanning - Why use it?

Group scanning is useful when:

• there are a large number of items in the selection set
   
• the items can be arranged in groups either by association (e.g. foods, drinks) or by their location on the screen
   
• the user can understand how to control the highlighter to first scan a group and then the item in the group

However, although Group scan is faster than Simple scan, it is more physically demanding as requires a greater number of switch activiations to select an item.