Concept selection (pugh’s method)

The criteria for comparison:

·         Cost

·         Weight

·         Size

·         durability

·         Rigidity

·         Flexibility

·         Accuracy

·         Easy to attach/detach the pen

·         Simplicity

The concepts to be compared

Concept A	Concept B	Concept C	Concept D
Material: Metallic Fixed angle Fixed hole size	Material: Plastic Fixed angle Adjustable hole size	Metallic Adjustable angle Adjustable hole size	Metallic Adjustable angle Adjustable hole size LCD screen for accurate measurement

Given that

Row	Criteria	Concept
		B	A	C	D
1	Cost	+	Datum	-	-
2	Weight	+		=	-
3	Size	=		=	=
4	durability	-		+	+
5	rigidity	-		+	+
6	Flexibility	-		+	+
7	accuracy	=		=	+
8	Easy to attach/detach the pen	=		+	+
9	simplicity	+		-	-
	Pluses	3	0	4	5
	Minuses	3	0	2	3