House of Quality Example in Software Quality - GeeksforGeeks

31 Aug, 2020
Prerequisite – Quality Function Deployment (QFD)
House of Quality and its parts have been discussed in prerequisite article. Here, we will understand how to construct a house of quality from scratch.
Question :Construct House of Quality diagram for product – CHOCOLATE.
Let’s first identify Customer requirements (WHATs) and design or technical specifications (HOWs) :
WHATs for product – chocolate could be :Appetizing appearanceGood textureFlavorsLow priceHealthy and Low fatsGood taste
Appetizing appearanceGood textureFlavorsLow priceHealthy and Low fatsGood taste
Appetizing appearance
Good texture
Flavors
Low price
Healthy and Low fats
Good taste
HOWs for the product – chocolate are :ColorWeightSize/DimensionPackagingChoice of flavorsQuantity of milkSugar content
ColorWeightSize/DimensionPackagingChoice of flavorsQuantity of milkSugar content
Color
Weight
Size/Dimension
Packaging
Choice of flavors
Quantity of milk
Sugar content
Now, let’s fill all of them in House of Quality diagram :
Now, let’s make use of body ranking system shown below and assign rank symbols in body of house of quality by identifying correlation between WHATs and HOWs.
Strong correlation exists between :Appetizing appearance – ColorGood texture – ColorGood texture – PackagingFlavors – Choice of flavorsFlavors – Sugar contentHealthy and Low fats – Quantity of MilkGood taste – Sugar content
Appetizing appearance – ColorGood texture – ColorGood texture – PackagingFlavors – Choice of flavorsFlavors – Sugar contentHealthy and Low fats – Quantity of MilkGood taste – Sugar content
Appetizing appearance – Color
Good texture – Color
Good texture – Packaging
Flavors – Choice of flavors
Flavors – Sugar content
Healthy and Low fats – Quantity of Milk
Good taste – Sugar content
Moderate correlation exists between :Appetizing appearance – WeightAppetizing appearance – PackagingAppetizing appearance – Choice of flavorsLow price – Size/DimensionLow price – Quantity of MilkGood taste – Choice of flavorsGood taste – Quantity of Milk
Appetizing appearance – WeightAppetizing appearance – PackagingAppetizing appearance – Choice of flavorsLow price – Size/DimensionLow price – Quantity of MilkGood taste – Choice of flavorsGood taste – Quantity of Milk
Appetizing appearance – Weight
Appetizing appearance – Packaging
Appetizing appearance – Choice of flavors
Low price – Size/Dimension
Low price – Quantity of Milk
Good taste – Choice of flavors
Good taste – Quantity of Milk
Weak correlation exists between :Appetizing appearance – Size/DimensionAppetizing appearance – Quantity of MilkFlavors – Quantity of MilkLow price – Choice of flavorsHealthy and Low fats – Choice of flavorsGood taste – Packaging
Appetizing appearance – Size/DimensionAppetizing appearance – Quantity of MilkFlavors – Quantity of MilkLow price – Choice of flavorsHealthy and Low fats – Choice of flavorsGood taste – Packaging
Appetizing appearance – Size/Dimension
Appetizing appearance – Quantity of Milk
Flavors – Quantity of Milk
Low price – Choice of flavors
Healthy and Low fats – Choice of flavors
Good taste – Packaging
The rest of cells in body of matrix have no correlation, so they are left empty. Importance factor is assigned by team on basis of prioritized customer requirements. In our example, let’s assign importance factor as follows :Appetizing appearance – 2Good texture – 3Flavors – 3Low price – 1Healthy and Low fats – 4Good taste – 5After filling body, house of quality diagram will be as follows :Now, let’s fill roof of house of quality in a similar manner by following roof ranking system given below.Strong positive Interaction :Weight – SizePositive Interaction :Color – Choice of flavorColor – Quantity of milkWeight – PackagingSize – PackagingChoice of flavor – Sugar contentChoice of flavor – Quantity of milkNegative Interaction :Weight – Choice of flavorStrong negative Interaction :Color – WeightColor – SizeSize – Quantity of milkSize – Sugar contentThe rest of interactions are None Updated house of quality diagram is shown below :The next step is to fill competitor comparison part. So, this part can be filled either by product development team or by conducting surveys or taking feedback from customers.Now, let’s calculate Importance Weight and Relative Importance Weight.Importance Weight (Color) 
= 9 * 2 + 3 * 9 + 3 * 1 = 48

Importance Weight (Weight) 
= 3 * 2 = 6

Importance Weight (Size) 
= 2 * 1 + 1 * 3 = 5

Importance Weight (Packaging) 
= 2 * 3 + 3 * 9 + 5 * 1 = 38

Importance Weight (Choice of flavor) 
= 2 * 3 + 3 * 9 + 1 * 1 + 4 * 1 + 5 * 3 = 53

Importance Weight (Quantity of milk) 
= 2 * 1 + 3 * 1 + 1 * 3 + 4 * 9 + 5 * 3 = 59

Importance Weight (Sugar content) 
= 3 * 9 + 5 * 9 = 72

Total Importance Weight 
= 48 + 6 + 5 + 38 + 53 + 59 + 72 
= 281Now, Relative Importance Weight :Relative Importance Weight (Color) 
= ( 48 / 281 ) * 100 = 17.1

Relative Importance Weight (Weight) 
= ( 6 / 281 ) * 100 = 2.14

Relative Importance Weight (Size) 
= ( 5 / 281 ) * 100 = 1.78

Relative Importance Weight (Packaging) 
= ( 38 / 281 ) * 100 = 13.5 

Relative Importance Weight (Choice of flavor) 
= ( 53 / 281 ) * 100 = 18.86

Relative Importance Weight (Quantity of milk) 
= ( 59 / 281 ) * 100 = 21.0

Relative Importance Weight (Sugar content) 
= ( 72 / 281 ) * 100 = 25.6
Now, we need to fill these values in house of quality. The final house of quality diagram is shown below :Note –The low level of house of quality is filled using more specific target values for product and other competitor’s products.My Personal Notes
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Appetizing appearance – 2Good texture – 3Flavors – 3Low price – 1Healthy and Low fats – 4Good taste – 5
Appetizing appearance – 2
Good texture – 3
Flavors – 3
Low price – 1
Healthy and Low fats – 4
Good taste – 5
After filling body, house of quality diagram will be as follows :
Now, let’s fill roof of house of quality in a similar manner by following roof ranking system given below.
Strong positive Interaction :Weight – Size
Weight – Size
Weight – Size
Positive Interaction :Color – Choice of flavorColor – Quantity of milkWeight – PackagingSize – PackagingChoice of flavor – Sugar contentChoice of flavor – Quantity of milk
Color – Choice of flavorColor – Quantity of milkWeight – PackagingSize – PackagingChoice of flavor – Sugar contentChoice of flavor – Quantity of milk
Color – Choice of flavor
Color – Quantity of milk
Weight – Packaging
Size – Packaging
Choice of flavor – Sugar content
Choice of flavor – Quantity of milk
Negative Interaction :Weight – Choice of flavor
Weight – Choice of flavor
Weight – Choice of flavor
Strong negative Interaction :Color – WeightColor – SizeSize – Quantity of milkSize – Sugar content
Color – WeightColor – SizeSize – Quantity of milkSize – Sugar content
Color – Weight
Color – Size
Size – Quantity of milk
Size – Sugar content
The rest of interactions are None Updated house of quality diagram is shown below :The next step is to fill competitor comparison part. So, this part can be filled either by product development team or by conducting surveys or taking feedback from customers.Now, let’s calculate Importance Weight and Relative Importance Weight.Importance Weight (Color) 
= 9 * 2 + 3 * 9 + 3 * 1 = 48

Importance Weight (Weight) 
= 3 * 2 = 6

Importance Weight (Size) 
= 2 * 1 + 1 * 3 = 5

Importance Weight (Packaging) 
= 2 * 3 + 3 * 9 + 5 * 1 = 38

Importance Weight (Choice of flavor) 
= 2 * 3 + 3 * 9 + 1 * 1 + 4 * 1 + 5 * 3 = 53

Importance Weight (Quantity of milk) 
= 2 * 1 + 3 * 1 + 1 * 3 + 4 * 9 + 5 * 3 = 59

Importance Weight (Sugar content) 
= 3 * 9 + 5 * 9 = 72

Total Importance Weight 
= 48 + 6 + 5 + 38 + 53 + 59 + 72 
= 281Now, Relative Importance Weight :Relative Importance Weight (Color) 
= ( 48 / 281 ) * 100 = 17.1

Relative Importance Weight (Weight) 
= ( 6 / 281 ) * 100 = 2.14

Relative Importance Weight (Size) 
= ( 5 / 281 ) * 100 = 1.78

Relative Importance Weight (Packaging) 
= ( 38 / 281 ) * 100 = 13.5 

Relative Importance Weight (Choice of flavor) 
= ( 53 / 281 ) * 100 = 18.86

Relative Importance Weight (Quantity of milk) 
= ( 59 / 281 ) * 100 = 21.0

Relative Importance Weight (Sugar content) 
= ( 72 / 281 ) * 100 = 25.6
Now, we need to fill these values in house of quality. The final house of quality diagram is shown below :Note –The low level of house of quality is filled using more specific target values for product and other competitor’s products.My Personal Notes
arrow_drop_upSave
The next step is to fill competitor comparison part. So, this part can be filled either by product development team or by conducting surveys or taking feedback from customers.
Now, let’s calculate Importance Weight and Relative Importance Weight.
Importance Weight (Color) 
= 9 * 2 + 3 * 9 + 3 * 1 = 48

Importance Weight (Weight) 
= 3 * 2 = 6

Importance Weight (Size) 
= 2 * 1 + 1 * 3 = 5

Importance Weight (Packaging) 
= 2 * 3 + 3 * 9 + 5 * 1 = 38

Importance Weight (Choice of flavor) 
= 2 * 3 + 3 * 9 + 1 * 1 + 4 * 1 + 5 * 3 = 53

Importance Weight (Quantity of milk) 
= 2 * 1 + 3 * 1 + 1 * 3 + 4 * 9 + 5 * 3 = 59

Importance Weight (Sugar content) 
= 3 * 9 + 5 * 9 = 72

Total Importance Weight 
= 48 + 6 + 5 + 38 + 53 + 59 + 72 
= 281
Now, Relative Importance Weight :
Relative Importance Weight (Color) 
= ( 48 / 281 ) * 100 = 17.1

Relative Importance Weight (Weight) 
= ( 6 / 281 ) * 100 = 2.14

Relative Importance Weight (Size) 
= ( 5 / 281 ) * 100 = 1.78

Relative Importance Weight (Packaging) 
= ( 38 / 281 ) * 100 = 13.5 

Relative Importance Weight (Choice of flavor) 
= ( 53 / 281 ) * 100 = 18.86

Relative Importance Weight (Quantity of milk) 
= ( 59 / 281 ) * 100 = 21.0

Relative Importance Weight (Sugar content) 
= ( 72 / 281 ) * 100 = 25.6

Now, we need to fill these values in house of quality. The final house of quality diagram is shown below :
Note –The low level of house of quality is filled using more specific target values for product and other competitor’s products.
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