1. PRODUCT DESIGN SPECIFICATION
MANUFACTURE REQUIREMENTS
Processes
Materials
Assembly
Packing
Quantity
Delivery date
PERFORMANCE REQUIREMENTS
Function(s)
Appearance
Reliability
Environment
Ex-works cost
Ergonomics
Quality
Weight
Noise
OPERATION
REQUIREMENT
Installation
Use
Maintenance
Safety
DISPOSAL
Standards
Legislation
Company policy
Hazards
ACCEPTANCE
STANDARDS
Inspection
Testing
Patents
Figure 1. - Product Design Specification criteria

2. Fig. 3 - Influence of quantity on cost
Figure Alternative manufacturing
Processes for lever; a) – cast iron,
b) – die forged steel,
c) - hammer forged steel,
d) - welded steel

3. Fig. 4 - Modern rocking lever; a) – thick to prevent bending,
b) – little or no bending