Assigning weights to the objectives :

Sl.no	Objectives	Weights
1	Portability	5
2	Semi-automatic	8
3	Attractiveness	8
4	User-friendly	6

Pugh chart :

Design objectives	weights	Design 1	Design 2	Design 3	Design 4	Design 5
Portability	5	++	++	++	++	Datum
Semi-automatic	8	++	+	+	+	Datum
Attractiveness	8	++	-	-	+	Datum
User-friendly	6	+	+	+	+	Datum
Score(+)		48	24	24	32	0
Score(-)			8	8		0
Total		48	16	16	32	0

5.1 Justification for scores given :

Design No.	Objective	Score alloted	Justification for score
Design 1	Portability	10	very portable
---	Semi-automatic	16
---	Attractiveness	16
---	User-friendly	6
Design 2	Portability	10
---	Semi-automatic	8
---	Attractiveness	-8
---	User-friendly	6
Design 3	Portability	10
---	Semi-automatic	8
---	Attractiveness	-8
---	User-friendly	6
Design 4	Portability	10
---	Semi-automatic	8
---	Attractiveness	8
---	User-friendly	6
Design 5	Portability	Datum
---	Semi-automatic	Datum
---	Attractiveness	Datum
---	User-friendly	Datum

5.2 Selected Design :

5.3 Product architecture :

5.4 Function clustering :

Sl.no	Subsystem
1	Indication
2	Handling coin
3	Display

5.5 Interaction between subsystems :

Indication subsystem	Handling coin subsystem	Display subsystem
Spatial		Yes
Data	Yes
Material

Handling coin subsystem	Indication subsystem	Display subsystem
Spatial
Data	Yes
Material	Yes

Display subsystem	Indication subsystem	Handling coin subsystem
Spatial	Yes
Data
Material		Yes