4.1 Weightage of objectives

SI NO	Objectives	Weights
1	Maintainence	3
2	Portability	6
3	Cost	7
4	Safety	9
5	Attraction	8
6	User-friendly	7

4.2 PUGH chart

Design Objectives	Weightage	Design 1	Design 2	Design 3	Design 4
Maintenance	3	-	0	Datum	+
Portability	6	-	+	Datum	0
Safety	9	++	+	Datum	+
Attraction	8	++	-	Datum	-
Cost	7	-	+	Datum	0
User friendly	7	+	+	Datum	+
Score(+)		41	29	0	19
Score(-)		16	8	0	8
Total		25	21	0	11

4.3 Justification

Design No.	Objective	Score Allocated	Justification of the score
1	Maintenance	-3	Regular oiling is necessary (MONTHLY)
	Portability	-6	Used components are bigger making the model less portable.
	Safety	18	Model is covered with insulating material, hence it is easy to use.
	Attraction	16	It uses a gear mechanism which makes it more attractive
	Cost	-7	Used components have a long life making the model costly.
	Userfriendly	7	Easy to operate the controls manually.
2	Maintenance	0	regular oiling is not necessary.
	Portability	6	The arrangements of parts in this model are compact, so it can be portable easily.
	Safety	9	Model is covered with insulating material, hence it is easy to use.
	Attraction	-8	It uses a cam mechanism which makes it a bit less attractive
	Cost	7	Used components are cheaper, hence the model is cheap.
	Userfriendly	7	Easy to operate the controls.
3	Maintainence	Datum	----------------
	Portability	Datum	----------------
	Safety Datum	Datum	----------------
	Attraction	Datum	----------------
	Userfriendly	Datum	----------------
4	Maintenance	3	Mechanism is easy
	Portability	0	Used components are small, reducing the size of the model.
	Safety	9	Model is covered with both insulating and conducting material.
	Attraction	-8	It uses a cam mechanism which makes it a bit less attractive.
	Cost	0	Used components are cheaper, hence the model is cheap.
	User-friendly	7	Easy to operate the controls.

4.4 Selected design

4.5 Function Clustering

4.6 Subsystem List

SI NO	Subsystem
1	Coin detection unit
2	Rotation unit
3	Display unit

4.7 Interaction details