Development of an Efficient Steel Beam Section for Modular Construction Based on Six-Sigma

Table 9

Selection of the optimal design using the Pugh matrix methodology.

Better +; Same S; Worse −		Reference	Concept 1	Concept 2	Concept 3	Concept 4	Concept 5	Concept 6	Concept 7
Key criteria	Weight
Manufacturing cost	5	S	+	+	S	S	+	+	−
Fire proofing cost	4	S	−	−	−	−	−	−	−
Steel quantity	4	S	+	+	+	+	−	−	+
Easy fabrication	3	S	+	+	+	+	+	+	+
New investment	5	S	−	−	−	−	+	+	−
Compatibility	4	S	−	+	−	+	−	+	−
Creativity	3	S	+	+	+	+	S	S	S
Sum of +		0	4	5	3	4	3	4	2
Sum of −		0	3	2	3	2	3	2	4
Sum of S		7	0	0	1	1	1	1	1
Weighted sum of +		0	15	19	10	14	13	17	7
Weighted sum of −		0	13	9	13	9	12	8	18