Use it as a quick tool when a group must select one or more items from a list, for example as generated by a Brainstorming session.
Use it when it is important that the group accept the result as fair.
Use it when the knowledge to enable selection is spread within the group.
Use it when the opinion of all group members is equally valued.
It can also be used to 'test the water', to determine opinions without committing to a final selection.
Use it, rather than a Prioritization Matrix, when the added accuracy of the Prioritization Matrix is not worth the extra effort.