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QFDQFD
Products andProducts andServicesServices
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Quality FunctionQuality Function
Deployment (QFD)Deployment (QFD)Translates the voice of theTranslates the voice of the
customer into technical designcustomer into technical design
requirementsrequirements
Displays requirements in matrixDisplays requirements in matrix
diagramsdiagrams
First matrix called house of qualityFirst matrix called house of quality
Series of connected housesSeries of connected houses
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House of QualityHouse of Quality
Trade-off matrix
Designcharacteristics
Customer
requirements
Target values
Relationship
matrix
Competitive
assessment
Importan
ce
11 22
33
44
55
66
Figure 3.7Figure 3.7
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House of QualityHouse of QualityFigure 3.8Figure 3.8
Irons
well
Easyan
d
safetou
se
Competitive Assessment
Customer RequirementsCustomer Requirements 1 2 3 4 5
Presses quickly 9 B A XX
Removes wrinkles 8 AB XX
Doesnt stick to fabric 6 XX BA
Provides enough steam 8 AB XX
Doesnt spot fabric 6 XX AB
Doesnt scorch fabric 9 A XXB
Heats quickly 6 XX B A
Automatic shut-off 3 ABXX
Quick cool-down 3 XX A B
Doesnt break when dropped 5 AB XX
Doesnt burn when touched 5 AB XX
Not too heavy 8 XX A B
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House of QualityHouse of QualityFigure 3.9Figure 3.9
Energynee d
edtopress
Weightofir o
n
Sizeofsolep
late
Thicknessof
soleplate
Materialus ed
insoleplate
Numberof h
oles
Sizeofhole s
Flowofwa te
rfromho
les
Timerequir e
dtoreach
450F
Timetogo f
rom450
to100
Protectiveco
verforso
leplate
Automaticsh
utoff
Customer RequirementsCustomer Requirements
Presses quickly - - + + + -
Removes wrinkles + + + + +
Doesnt stick to fabric - + + + +
Provides enough steam + + + +
Doesnt spot fabric + - - -
Doesnt scorch fabric + + + - +
Heats quickly - - + -
Automatic shut-off +
Quick cool-down - - + +
Doesnt break when dropped + + + +
Doesnt burn when touched + + + +
Not too heavy + - - - + -
Irons
well
Easyan
d
safetou
se
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House of QualityHouse of QualityFigure 3.10Figure 3.10
Energyneededto
press
Weightofiron
Sizeofsoleplate
Thickness
ofsole
plate
Materialu
sedinso
leplate
Numbero
fholes
Sizeofho
les
Flowofwaterfrom
holes
Timerequiredto
reach450
Timetogofrom
45
0to100
Protectivecover
forsoleplat e
Automaticshutof
f
--
++
+
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House of QualityHouse of QualityFigure 3.11Figure 3.11
Ene
rgyne
ededtopress
Weightof
iron
Size
ofso
leplate
Thic
kness
ofsoleplate
Materialu
sedinso
leplate
Num
bero
fholes
Size
ofho
les
Flow
ofw
aterfromholes
Timerequ
iredtoreach4
50
Timetog
ofrom450to
100
Protectivecoverfo
rsole
plate
Automaticshutoff
Units of measure ft-lb lb in. cm ty ea mm oz/s sec sec Y/N Y/N
Iron A 3 1.4 8x4 2 SS 27 15 0.5 45 500 N Y
Iron B 4 1.2 8x4 1 MG 27 15 0.3 35 350 N Y
Our Iron (X) 2 1.7 9x5 4 T 35 15 0.7 50 600 N YEstimated impact 3 4 4 4 5 4 3 2 5 5 3 0
Estimated cost 3 3 3 3 4 3 3 3 4 4 5 2
Targets 1.2 8x5 3 SS 30 30 500
Design changes * * * * * * *
Objective
measures
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House of QualityHouse of Quality
Figure 3.12Figure 3.12
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Series of QFD HousesSeries of QFD Houses
Custo
mer
requirements
HouseHouseofof
qualityquality
Product
characteristics
A-1
Product
characteristic
s
PartsParts
deploymentdeployment
Part characteristics
A-2
Part
char
acteristics
ProcessProcessplanningplanning
Process
characteristics
A-3
Process
characteristic
s
OperatingOperatingrequirementsrequirements
Operations
A-4
Figure 3.13Figure 3.13
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Benefits of QFDBenefits of QFD
Promotes better understanding ofPromotes better understanding ofcustomer demandscustomer demands
Promotes better understanding of designPromotes better understanding of design
interactionsinteractions Involves manufacturing in theInvolves manufacturing in the
design processdesign process
Breaks down barriers betweenBreaks down barriers betweenfunctions and departmentsfunctions and departments
Provides documentation ofProvides documentation ofthe design processthe design process