Selected Design/Concept:

4.1 Assign weights to the object

Objectives	Weights
time of vending	9
Ease of use	7
Portability	5
Storage capacity	6
Cost	3

4.2 Pugh Chart

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Time of Vending	9	-	DATUM	+	--
Ease of use	7	0	DATUM	0	0
Portability	5	+	DATUM	-	0
Storage capacity	6	+	DATUM	0	-
Cost	3	++	DATUM	-	-
Score(+)		17		9	0
Score (-)		-9		-8	-27
Total		8		1	-27

4.3 Justification

4.5 Function clustering

4.6 Sub-systems list

SL. No.	Subsystem
1	Interface unit
2	Motion control unit

4.7 Interaction Details

Interface unit	Motion Control Unit	sensing unit
Spatial		Y
Data	Y	Y
Material		Y

Motion Control Unit	Interface Unit	sensing unit
Spatial
Data	Y	Y
Material