5.1 Prioritized Objectives

Objectives	Weightage
Ease of use	7
Portability	6
Automatic/Manual	8
Cost	6

5.2 Pugh Chart

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Ease of use	7	Datum	PP	P	P
Portability	6	Datum	P	P	P
Automatic/Manual	8	Datum	P	P	P
Cost	6	Datum	P	N	PP
Score (+)		0	39	31	38
Score (-)		0	0	-6	0
Total		0	39	25	38

5.3 Justification

Design	Objectives	Score Given	Justification
1.	Ease of use	0	Datum
	Portability	0	Datum
	Automatic/Manual	0	Datum
	Cost	0	Datum
2.	Ease of use	14	It is easy to use
	Portability	6	It is easy to carry
	Automatic/Manual	8	It is automatic
	Cost	18	Cost is less
3.	Ease of use	7	It is quite difficult to use
	Portability	6	It is difficult to carry
	Automatic/Manual	8	It is automatic
	Cost	-6	It is more expensive compared to datum
4.	Ease of use	7	It is quite difficult to use
	Portability	6	It is difficult to carry
	Automatic/Manual	8	It is automatic
	Cost	12	It is bit expensive compared to datum

5.4 Selected design

5.5 Function Clustering

5.6 Subsystem

Subsystems identified were:

1.Notification Unit

2.User Input

3.Evaluation Unit

Notification Unit	With User Input	With Evaluation Unit
Material Interaction	✓	-
Data Interaction	✓	-
Spatial Interaction	✓	-

User Input	With Evaluation Unit	With Notification Unit
Material Interaction	-	✓
Data Interaction	✓	✓
Spatial Interaction	-	✓

Evaluation Unit	With Notification Unit	With User Input
Material Interaction	-	-
Data Interaction	-	✓
Spatial Interaction	-	-

5.7 Interaction Details