Quality Function Deployment

Example Needs HierarchyExample Needs Hierarchy

The Most Important Elements :Performance Performance Durability Durability Reliability Reliability

Maintainability Maintainability Features Features Safety Safety Conformance to specificationsConformance to specifications Aesthetics/ Appearance Aesthetics/ Appearance

Others :Others :PricePrice SafetySafety ErgonomicsErgonomics

Measure of quality

ReliabilityReliability- the ability of an item to perform under stated condition for a stated - the ability of an item to perform under stated condition for a stated period of time. period of time. (BS 7000 Part 10 1999)(BS 7000 Part 10 1999)

- reliability is often linked to quality (fitness for purpose) because it - reliability is often linked to quality (fitness for purpose) because it takes quality in “manufacture” to achieved reliability. takes quality in “manufacture” to achieved reliability.

- Can cause poor reputation to a company or brand name.- Can cause poor reputation to a company or brand name.

MaintainabilityMaintainability- the ease with which faults can be corrected after sales.- the ease with which faults can be corrected after sales.

- ensure that the product that interface with your product and service - ensure that the product that interface with your product and service is reliable. is reliable.

AestheticsAesthetics- product has a pleasing appearance.- product has a pleasing appearance.

- consider also other senses, such as : - consider also other senses, such as : soundsound (e.g. sports car exhaust tone) (e.g. sports car exhaust tone) smellsmell (e.g. the smell of new car) (e.g. the smell of new car)

SafetySafety- consumer must perceived the product is save and it must be really - consumer must perceived the product is save and it must be really safe. safe.

ErgonomicErgonomic- ease of use, means easy and obvious to use.- ease of use, means easy and obvious to use.- consumer will not purchase another product of the same make if it - consumer will not purchase another product of the same make if it is difficult to use. is difficult to use.

PricePrice- the price is affordable with the features offered or compare with - the price is affordable with the features offered or compare with similar products in the market. similar products in the market.

Quality Function Deployment

A technique for identifying customer requirements and matching them with engineering design and performance parameters.

The strategic arrangement (deployment) throughout all aspects of a product (functions) of appropriate characteristics (qualities) according to customer demands – from Japanese phrase.

Useful tool for formulating design problems for products in situations where several competing products are already on the market.

The Quality Function Deployment Process

1. Identify the Customer(s)2. Determine Customer Requirements/Constraints3. Prioritize each requirement4. Competitive Benchmarking5. Translate Customer Requirements into

Measurable Engineering specifications6. Set Target values for each Engineering

Specification

Quality Function Deployment/ House of Quality

Constructing a QFD Table The general arrangement of a QFD table consists of the

following five regions:1. Customer requirements. Listing of the features or

characteristics of the design that the customer indicates are relevant. The list obtained from direct conversation with customer, observations of customer usage patterns with similar products, from customer response to a survey, or from a source such as Consumer’s Reports. Avoid misinterpretation by engineers or marketing staff.

2.7 Quality function deployment/ House of quality

2. Engineering Requirements. Listing is generated by the engineering staff and contains those quantifiable aspects of the system that can contribute to satisfying the customer requirements. Include as many requirements that can you think. Some customer requirements might be in the form of engineering requirements.

3. Matrix of Requirements Relations. Consists of marks on whether or not the customer requirements and engineering requirements are met.

4. Competitive Benchmarking. Comparison your design to that of competitor.

5. Engineering Targets. Units associated with each of the engineering requirements, along with numerical values of the targets. The targets for each engineering requirement may be the value that the requirement must achieve in order to compete with the alternative products that are used as the benchmarks.

Figure 13: Structure of Quality Function Deployment Chart

Figure 14: QFD Chart for Automobile Bumper