Lastly it must be recognized that system

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Unformatted text preview: uring design trade studies may shift to a product view. This is not unlike the progression of the cost modeling from simple parametrics to more detailed grass-roots estimates. The system engineer must tailor the effectiveness measure and its measurement method to the resolution of Practical Pitfalls in Using Effectiveness Measures in Trade Studies Obtaining trustworthy relationships among the system performance or technical attributes and system effectiveness is often difficult, Purported effectiveness mod els often only treat one or two of the facets described in the text. Supporting models may not have been prop erly integrated. Data are often incomplete or unreliable. Under these conditions, reported system effectiveness results for different alternatives in a trade study may show only the relative effectiveness of the alternatives within the context of the trade study. The system engineer must recognize the practical pitfalls of using such results. NASA Systems Engineering Handbook Systems Analysis and Modeling Issues the system design. As the system design and operational concept mature, effectiveness estimates should mature as well. The system engineer must be able to provide realistic estimates of system effectiveness and its underlying performance and technical attributes not only for trade studies, but for project management through the tracking of TPMs. This discussion so far has been predicated on one accepted measure of system effectiveness. The job of computing system effectiveness is considerably easier when the system engineer has a single measure and measurement method (model). But, as with costs, a single measure may not be possible. When it does not exist, the system engineer must fall back to computing the critical high-level, but nevertheless still underlying, system performance or technical attributes. In effect, these high-level performance or technical attributes are elevated to the status of measures of (system) effectiveness (MoEs) for trade study purposes, even though they do not represent a truly comprehensive measure of system effecti...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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