Trade Study Analysis of Alternatives in .NET

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Trade Study Analysis of Alternatives
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1.3 1.0 0.8 0.5 0.3
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Minimum Acceptable Performance Solution 4 is Non-Compliant with MAXIMUM Cost Per Unit Criteria Design-to-Cost (DTC) Level
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Trade Space
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Solution 1 is Technically Non-Compliant with MINIMUM Performance Criteria
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Where: X = Candidate Solutions
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Figure 52.4 Candidate Trade Space Zone
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Solutions 1 and 4 fall outside the trade space. Solution 1 is cost compliant but technically noncompliant. Solution 4 is technically compliant but cost noncompliant. When this occurs, the Trade Study Report (TSR) documents that Solutions 1 and 4 were considered and determined by analysis to be noncompliant with the trade space decision criteria and were eliminated from consideration. Following elimination of Solutions 1 and 4, Solutions 2 and 3 undergo further analysis to thoroughly evaluate and score other considerations such as organizational risk.
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The previous discussion illustrates the basic concept of a two-dimensional trade space. A trade space, however, is multidimensional. For this reason it is more aptly described as a multidimensional trade volume that encompasses technical, life cycle cost, schedule, support, and risk decision factors. We can illustrate the trade volume using the graphic shown in Figure 52.5. To keep the diagram simple, we constrain our discussion to a three-dimensional model representing the convolution of technical, cost, and schedule factors. Let s explore each dimension represented by the trade volume. Performance Schedule Trade Space The graphic in the upper left-hand corner of the diagram represents the performance vs. schedule trade space. Identi er 1 marks the location of the selected performance versus schedule solution. Performance Cost Trade Space The graphic in the upper right-hand corner includes represents the performance cost trade space. Identi er 2 marks the location of the selected performance versus cost solution. Cost Schedule Trade Space The graphic in the lower right-hand corner of the diagram represents the Cost Schedule trade space. Identi er 3 marks the location of the selected cost versus schedule solution.
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52.6 The Trade Study Process
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Performance
Minimum Acceptable Performance
Schedule 5 2 Cost
ScheduleSchedulePerformance Performance Trade Space Trade Space
Cost
CostCostPerformance Performance Trade Space Trade Space
Maximum Acceptable Schedule
6 Trade Space Volume
3 Cost
Schedule
CostCostSchedule Schedule Trade Space Trade Space
Maximum Acceptable Cost
Schedule
Figure 52.5 Trade Space Interdependencies
If we convolve these trade spaces and their boundary constraints into a three-dimensional model, the cube in the center of the diagram results. The optimal solution selected is represented by the intersection of orthogonal lines in their respective planes. Conceptually, the optimal solution would lie on a curve that represents the convolution of the performance schedule, performance cost, and cost schedule curves. Since each plane includes a restricted trade space, the integration of these planes into a three-dimensional model results in a trade space volume.
52.6 THE TRADE STUDY PROCESS
Trade studies consist of highly iterative steps to analyze the issues to be resolved into a set prioritized recommendations. Figure 52.6 represents a basic Trade Study Process and its process steps. Let s brie y examine the process through each of its steps. Process Step 1: Process Step 2: Process Step 3: Process Step 4: Process Step 5: Process Step 6: Process Step 7: Process Step 8: De ne the trade study objective(s). Identify decision stakeholders. Identify trade study individual or team. De ne the trade study decision factors/criteria. Charter the trade study team. Review the Trade Study Report (TSR) Select the preferred approach. Document the decision.
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Trade Study Analysis of Alternatives
Start
Define Trade Define Trade Study Objective(s) Study Objective(s)
Identify Decision Identify Decision Stakeholders Stakeholders Identify Trade Identify Trade Study Team Study Team Identify Decision Identify Decision Factors/Criteria Factors/Criteria Charter Charter Trade Charter Trade Study Team Study Team Conduct Trade Conduct Trade Study Study
Trade Study Team
(If applicable)
Trade Study Decision Maker
Review Trade Review Trade Study Results Study Results
Select Approach Select Approach
Trade Study Report (TSR)
Stop
Document Document Decision Decision
Figure 52.6 Trade Study Process
Guidepost 52.1 Our discussion has identi ed the overall Trade Study Process. Now let s focus our attention on understanding the basic methodology that will be employed to conduct the trade study.
52.7 ESTABLISHING THE TRADE STUDY METHODOLOGY
Objective technical and scienti c investigations require a methodology for making decisions. The methodology facilitates the development of strategy, course of action, or roadmap of the planned technical approach to investigate, analyze, and evaluate the candidate solution approaches or options. Methodologies, especially proven ones, keep the study effort on track and prevent unnecessary excursions that consume resources and yield no productive results. There are numerous ways of establishing the trade study methodology. Figure 52.7 provides an illustrative example: Step 1: Step 2: Step 3: Step 4: Step 5: Step 6: Step 7: Step 8: Step 9: Step 10: Understand the problem statement. De ne the evaluation decision factors and criteria. Weight decision factors and criteria. Prepare utility function pro les. Identify candidate solutions. Analyze, evaluate, and score the candidate options. Perform sensitivity analysis. Prepare the Trade Study Report (TSR). Conduct peer/subject matter expert (SME) reviews. Present the TSR for approval.