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Concept |
It
is at this stage that the success or otherwise of
a project is largely determined. No amount of skill
or effort later can make a silk purse of a project
out of a sow's ear of a concept. |
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Estimate
Costs |
Many diverse concepts
have to be examined. Only performance requirements
are known with any certainty. The computer-based family
of FACET models provides the necessary speed, consistency
and ability to make performance-based estimates. |
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The
Achiles' Heel of Design-Based Estimating
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1. Identification of a design presumed to yield the required
performance. If made ahead of design and development work (e.g.
at the concept or assessment phases) this is necessarily an
uncertain presumption open to gross error. |
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2. Resulting costings may be accurate estimates of costs of
populated design yet may be underestimates of outturn costs
as greater size and/or complexity than postulated proves necessary
to meet performance requirements. |
If
they are to be reliable, cost estimates made at the concept
or assessment stages must be performance based, therefore.
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