Table 2.

Different types of collaborative interfaces

Number	Dimension	Variety
1	User	one, multiple
2	modality	only text, only speech, multi-modal
		(input with pointing device, output on a map, etc.)
3	purpose	socialize, (goal driven) information seeker,
		(goal driven) delegate action
4	data source	none, static, dynamic
5	form	virtual agent, physical device, robot
6	personalized	no, yes
7	domains	general, health, water, traffic, etc.