Development of an Efficient Steel Beam Section for Modular Construction Based on Six-Sigma
Table 2
Priority rating for the customer requirements.
Customers’ required quality
(1) Importance rating
(2) Satisfaction rating
(3) Possible quality levels
(4) Level-up ratio
(5) Sales Point
(6) Absolute priority
Priority Ratios
Ratings
Small steel quantity
4.6
2.8
4
1.4
○
7.7
10%
2
Low manufacturing cost
4.6
2.6
5
1.9
◎
13.1
17%
1
Easy structural design
3.6
3.4
4
1.2
4.3
5%
7
Easy architectural design
3.6
3.4
4
1.2
4.3
5%
7
Easy connection
3.6
3.4
4
1.2
4.3
5%
7
Transportation with low-bed trailer
3.6
3.2
4
1.3
4.7
6%
5
Transportation with cargo truck
3
3
3
1
3
4%
15
Easy installation of plumbing equipment
3.4
3.2
4
1.3
4.4
6%
6
A short time for stocking after order
3.6
2.8
4
1.4
○
6
8%
4
The stock is secured in advance
3
2.6
3
1.2
○
4.3
5%
7
Small manufacturing deformation
3.8
3
4
1.3
◎
7.4
9%
3
Less surface defects
3.6
2.8
3
1.1
4
5%
12
Easy application of high-strength steel
3
2.8
3
1.1
3.3
4%
14
Structural safety
3.6
3.6
4
1.1
4
5%
12
Less floor vibration
4.2
4
4
1
4.2
5%
11
(1) Importance rating: values obtained from customer survey (1~5). (2) Satisfaction rating: values obtained from customer survey (1~5). (3) Quality levels that may be obtained from the viewpoint of developers (1~5). (4) Level up ratio: (3)/(2). (5) Sales point from the viewpoint of developers (◎: 1.5, ○: 1.2). (6) Absolute priority: (1)(4)(5).
