3.Concept evaluation and Selected concept

Weights to the objectives

Objectives	Weights
Safety	9
Ease of use	8
Portability	7
Use of standard parts	7
Cost	6

Pugh chart

Design Objectives	Weights	Design-1	Design-2	Design-3	Design-4
Safety	9	+	Datum	+	0
Ease of use	8	++	Datum	+	0
Portability	7	++	Datum	+	+
Use of standard parts	7	0	Datum	0	+
Cost	6	+	Datum	++	0
Score(+)		45	0	36	14
Score(-)		0	0	0	0
Total		45	0	36	14

Justification

Design No.	Objective	Score allocated	Justification for the score
1	Safety	9	It is light weight and doesnot break the window
	Ease of use	16	It cleans the window throught and easy to operate
	Portability	14	It is easy to carry to any place
	Use of standard parts	0	The standard parts used are similar
	Cost	6	It is less cost
2	Safety	datum	-
	Ease of use	datum	-
	Portability	datum	-
	Use of standard parts	datum	-
	Cost	datum	-
3	Safety	9	It is light weight and it does not break the glass window
	Ease of use	8	It cleans the window better
	Portability	7	It is portable
	Use of standard parts	0	The standard parts used are similar
	Cost	12	The cost is too less
4	Safety	0	It has same weight
	Ease of use	0	Have same impact on use
	Portability	7	It is portable
	Use of standard parts	7	use of more standard parts
	Cost	0	The cost is same

Selected concept