QFD 设计案例

3.0 11.2 6.0
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3(i) Competitive Benchmarks
Webbing strength Padding thickness Meets standards Harness weight
Existing System Competitor #1 Competitor #2
[ASI, 2000]
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1(b) QFD - Benefits
[ASI, 2000]
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1(c) QFD - History
STATISTICAL PROCESS CONTROL DESIGN QUALITY VALUE ENGINEERING QFD
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1(d) Software Engineering Context
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# of buckles
3(j) Final Product Targets
Target System
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3(k) House of Quality Summary
Inputs:
Customer requirements Technical requirements Customer priorities Market reality / competitive analysis Organization’s strengths & weaknesses
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1. Introduction to QFD
?
Requirements Engineer
QFD
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1(a) QFD - Definition
VOICE OF THE CUSTOMER
+ =
QFD
CUSTOMER SATISFACTION
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1(a) QFD – Definition (Cont.)
Phase 2: Develop
Phase 3: Manufacture
Phase 4: Deliver
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2(b) SQFD Process
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3. The House of Quality
5. Roof 5. Roof 3. Technical 3. Technical Requirements Requirements
Im po rt
Comfortable Easy to Put On Fits over different clothes
5 1 2
2 1 3
5 2 4
2.5 2 1.3
1.4 1.0 1.1
17.5 2 2.9
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3(d) Technical Requirements
Engineering Characteristics, Voice of the Company. Identify Measurable Characteristics related to Customer Requirements. Direction of change included to lead to improvement of product performance.
Customer
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2. QFD Life Cycle Considerations
QFD Process SQFD Process
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2(a) Traditional QFD Phases
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2(b) Adapting QFD to Software
Measurable Objectives Customer Voice Measurable Objectives
COMFORTABLE EASY TO PUT ON FITS OVER DIFFERENT CLOTHES 5 5 4 4 3 3 2 2 1 1
5
4
3
2
1
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3(c) The Planning Matrix
Customer Satisfaction – existing products fulfilling specified requirements. Improvement Ratio = Planned Performance / Existing Performance Sales Point – weight for marketability Overall Weighting = Importance Weighting x Improvement Ratio X Sales Point
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3(f) “The Roof”
Webbing strength
Padding thickness
Legend
Meets standards
Harness weight
+ -
positive/ supporting negative/ tradeoff
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3(g) Targets
Title Card Group 1 Group 2 Group 3
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3(b) Affinity and Tree Diagrams
Does not restrict movement Fits over Different clothes Safe Attractive Lightweight Accessible Gear Loops Lightweight Comfortable Comfortable Fits over Different clothes Accessible Gear Loops Attractive Does not restrict movement Safe
4. Inter4. Interrelationships relationships
6. Targets 6. Targets
2. Planning Matrix
1. Customer Requirements
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3(a) Customer Requirements
Structured Requirements Document
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Overall Weighting
Webbing strength
# of buckles
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3(f) “The Roof”
Considers impact of technical requirements on each other Feature to feature comparison Augment or impede? Critical Question: Does improving one requirement cause a deterioration or improvement in another requirement?
Facilitates Climbing Usability Attractive Performance
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Exercise 1 – Affinity Workshop
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3(c) The Planning Matrix
Quantifies Customer Requirements. Quantifies Perceptions of Existing Products. Allows adjustment based on design team.
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3(c) The Planning Matrix
an ce We Cu igh sto me ti n g rS Pla ati nn sfa ed cti on Sa tisf Im act pro i on vem ent Ra Sa les tio Po int Ov era ll W eig hti ng
High Leve l Design High Level Design
Methods, tools Methods, tools
Procedures
Product Planning
Design Planning
Process Planning
Production Planning
Phase 1: Conceive
Quality Function Deployment
QFD for Software Requirements Management
Guy Davis Carmen Zannier Adam Geras
பைடு நூலகம்
Objectives
Upon completion of this chapter, students will:
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3(e) Interrelationships
Technical Requirements
Harness weight
High Medium Low Customer Requirements
(9) (3) (1)
Light weight Does not restrict movement Safe Technical Priority
Outputs
Prioritized technical requirements Measurable, testable goals
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Exercise 2 – Build a House of Quality
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3(l) House of Quality Pros and Cons