Class Notes (1,200,000)
CA (650,000)
Western (60,000)
ENGSCI (100)
Lecture 5

Lecture 5 - Customer Needs and Design Specifications 1. Design specification 2. Concept generation and selection 3. Detailed design


Department
Engineering Science
Course Code
ENGSCI 1050
Professor
James A Johnson
Lecture
5

Page:
of 2
Customers Needs & Design Specifications
September-27-10
1:30 PM
1. Design specification
2. Concept generation and selection
3. Detailed design
What the Customer wants?
Must be discriminatory
o Reveal differences between alternatives
Must be measurable
o We need to be able to determine if the requirements have been met or not
Must be orthogonal
o The requirements must not overlap
Must be universal
o An important attribute of all proposed alternatives
Must not impose design choices
o Should not limit design options
Example: BBQ Lighter
Customer Requirements
Lights a BBQ
Easy to use
Lightweight
Stylish
Reliable
Affordable
Customer Requirements are Qualitative
Design Specifications
Length 20cm
Weight 0.5N
Flame length 30mm
Works 200 times on one load
0.2N force required to release trigger
Design Specifications are Quantitative
Product Design Specs
How can we classify product design specs and what is their importance?
Not all customer requirements can be met 100% some are mutually exclusive
o Quality
Features
Attributes
o Function
Mechanization
o Deployment
Diffusion
Development
Evolution
1. Identify the customers
2. Determine the customers' requirements
3. Determine relative importance of the requirements
4. Generate engineering specifications
5. Relate customer's requirements to engineering specifications
6. Identify relationships between the engineering requirements
7. Identify and evaluate the competition
8. Set engineering targets