Application & Data Requirements - 2
Parametric (top down)
- Used as part of economic study, viability, etc
- And for comparing alternative options
- Based on "functional design", initial work on component diagrams, "use case" diagrams, preliminary flow sheets, etc
- Factored on parameters relevant to each identified component
- Plus judicious allowances for the circumstances
- Expectation of significantly higher accuracy
- Typical range -15% to +25%