System Developer Perspective in .NET

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System Developer Perspective
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In contrast, the System Developer must reduce contract cost, schedule, and technical risk. To do this, speci cation analysis must answer many questions. Key review questions might include: 1. Do we fully understand the scope of the effort we are signing up to perform 2. Do the system requirements, as stated, specify a system that satis es the User s operational needs If not, what approach must we use to inform them 3. Have we thoroughly investigated and talked with a representative cross section of the User community to validate their requirements and needs 4. Do we understand the problem the User is attempting to solve by procuring this system Does the speci cation bound the problem or a symption of the problem 5. Can the requirements, as stated, be veri ed within reasonable expectations, cost, schedule, and risk 6. Do these requirements mandate technologies that pose unacceptable risks
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30.3 Speci cation Analysis
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30.3 SPECIFICATION ANALYSIS
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Given the Acquirer and System Developer perspectives, HOW do they approach analysis of the speci cation The answer encompasses the methods and techniques identi ed in earlier questions in s 3 to 29. Due to the broad scope of this answer, we will brie y address some high level approaches you can apply to speci cation analysis.
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Visually Inspect the Speci cation Outline
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Examine the outline STRUCTURE for missing sections and topics that are crucial to developing a system of the type speci ed.
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Perform System Requirements Analysis (SRA)
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Perform a System Requirements Analysis (SRA) to understand WHAT the system is expected to do. Ask key questions such as: 1. Do the list of requirements appear to be generated as a feature-based wish list or re ect structured analysis 2. Do the requirements follow standard guidelines discussed later in Requirements Statement Development Practices 3. Do the requirements appear to have been written by a seasoned subject matter expert (SME) or semi-knowledgeable person 4. Do the requirements adequately capture User operational needs Are they necessary and suf cient 5. Do the requirements unnecessarily CONSTRAIN the range of viable solutions 6. Are all system interface requirements identi ed 7. Are there any TBDs remaining in the speci cation 8. Are there any critical operational or technical issues (COIs/CTIs) that require resolution or clari cation
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Perform Engineering Graphical Analysis
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1. Based on the requirements, as stated, can we draw a simple graphic of the system and its interactions with its OPERATING ENVIRONMENT 2. Are there any obvious holes in the graphic that are not speci ed as requirements in the speci cation
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Hierarchical Analysis
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1. Are there any misplaced, overlapping, duplicated, or con icting requirements 2. Are the requirements positioned and scoped at the right levels 3. Are there any holes in the set of requirements
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Technology Analysis
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Do the speci cation requirements indicate a willingness or unwillingness by the Acquirer to consider and accept new technologies or solutions
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30
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Speci cation Analysis
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Competitive Analysis
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Do the speci cation requirements favor or target a competitor s products, services, or organizational capabilities
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Modeling and Simulation Analysis
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If appropriate, is it worthwhile to develop models and simulations as decision aids to analyze system performance issues
Verifying Speci cation Requirements
1. Are there any requirements that are unreasonable, unveri able, or cost prohibitive using the veri cation methods speci ed 2. Does veri cation require any special test facilities, tools, equipment, or training
Validating Speci cation Requirements
When SEs analyze speci cations, especially those prepared by external organizations, most engineers presume the speci cation has been prepared by someone who: 1. Understands the User s problem space and solution space(s). 2. Accurately analyzes, translates, and articulates the solution space into requirements that can be implemented economically with acceptable risk, and so forth. Exercise CAUTION with this mindset! AVOID assuming anything UNTIL you have VALIDATED the speci cation requirements.
30.4 DEALING WITH CONTRACT SPECIFICATION DEFICIENCIES
Human systems, even with the best of intentions, are not perfect. Inevitably, every contract System Performance Speci cation (SPS) has blemishes, degrees of goodness, strong and weak points. Although the degree of goodness has an academic connotation, goodness resides in the minds and perceptions of the Acquirer and System Developer. Remember, one person s work of art may be viewed by another person as unorganized rambling. Discussions by both parties reach a point whereby willingness to entertain contract modi cation to eliminate speci cation blemishes or de ciencies are rejected. The Acquirer may want changes but is reluctant to request changes due to the System Developer taking advantage of the situation via cost changes. Conversely, the System Developer may WANT changes but the Acquirer is unwilling to allow any changes for FEAR of the unknown that may result from the changes. Even when both parties agree, there may be latent SPS de ciencies that lie dormant and go undiscovered until late in the System Development Phase of the contract. The best that can occur is for both parties to accommodate each other s wishes at no cost, assuming that is the appropriate and reasonable solution. Regardless of the scenario you may have a situation where the System Performance Speci cation (SPS) contains defects, de ciencies, or errors and the Acquirer refuses to modify the contract. What do you do One solution is to create an electronic System Design Notebook (SDN); some people refer to this as a Design Rationale Document (DRD). Why do you need an SDN or DRD You need a mechanism to record design assumptions and rationale for requirements allocations and design criteria.