Testing Derived Requirements Statements in .NET

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33.8 Testing Derived Requirements Statements
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conceivable scenario or instance of an entity. ALL, in a limitless context, is boundless and is subject to interpretation. Do yourself a favor and AVOID usage of ALL.
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Suggestion 10: Eliminate the Term and Abbreviation Etc.
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Et cetera is another word that we use constantly. Most engineers discover early in their careers there will always be someone who nit picks about miniscule instances of science or a natural occurrence and chastise the engineer for missing it. Thus, engineers learn to cover all cases by using the term etc. Again, when you develop speci cations, your mission is to specify and bound the solution space. When you state, As a minimum, the system shall consist of a, b, c, etc., the Acquirer could say later, Well, we also want a d, e, and f. You may reply we did not bid the cost of including a d, e, and f, which may then bring a response You agreed to the requirements and etc. means we can request anything we want to. Do yourself a favor and eliminate all instances of etc. in speci cations.
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Suggestion 11: Avoid the Term And/Or
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Speci cation writers often specify requirements via enumerated lists that include the term and/or.
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For example, . . . the system shall consist of capabilities: A, B, C, and/or D.
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Be explicit. Either the system consists of A, B, C, or D or it does not. If not, so state and bound exactly WHAT the system is to contain. Remember, speci cations must state exactly WHAT capabilities are required at SYSTEM delivery and acceptance.
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Many people are surprised to nd that you can test requirements. Requirement testing takes the form of technical compliance audits with organizational standards and conventions, such as coding standards and graphical conventions. Modeling and simulation provides another method for testing requirements. Execution of those models and simulations provides insights into the reasonableness of a requirement, performance allocation, potential con icts, and dif culty in veri cation. Requirement testing also includes inspection and evaluation of each requirements statement in accordance with pre-de ned criteria.
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Requirement Validation Criteria
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When testing the validity of a requirement by inspection or evaluation, there are a number of criteria that can be applied to determine the adequacy and suf ciency of the requirement. Table 33.7 provides an example listing of key criteria. The criteria stated in Table 33.7, though examples, are reasonably comprehensive. You are probably thinking how can you evaluate a speci cation with potentially hundreds of requirements using these criteria. First, seasoned SEs imprint these criteria subconsciously in their minds. With experience you will learn to test speci cation requirements rapidly. Second, for large speci cations, obviously groups of SEs must be participants in the testing and analysis exercise. This further demonstrates the criticality of training all SEs in the proper methods of requirements writing and review to ensure a level of con dence and continuity in the results.
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Requirements Statement Development
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Table 33.7 Requirement validation criteria ID 1. 2. 3. Criteria Unique identity Singleness of purpose Legitimacy and traceability SOW language avoidance Appropriateness Hierarchical level User priority Realism Achievability Feasibility Criteria Question Does the requirement have its own unique identity such as a title that re ects the subject capability and unique tracking identi er number Does the requirement specify and bound one and only one capability or are there compound requirements that should be broken out separately Is this a legitimate requirement that re ects a capability traceable to the User s intended operational needs or simply a random thought that may or may not be applicable Does this requirement include language that logically belongs within the Contract Statement of Work (CSOW) Does this requirement fall within the scope of this speci cation or does it belong in another speci cation If this requirement is within the scope of this speci cation, is the requirement positioned at the right level within the requirements hierarchy What is the User s priority level for this requirement can live without, nice to have, desirable, or mandatory Is the requirement realistic If the requirement is realistic, can it be achieved economically and at acceptable risk with available technology Can the requirement be implemented within reasonable need priorities and budgetary cost without limiting the minimum required set of requirements Is the requirement stated in unambiguous language in text and graphics Is the requirement simply stated in language that is easily understood by the document s stakeholders and ensures that any combination of stakeholders emerge with the same interpretation and understanding of WHAT is required after reading the requirement Does the requirement adequately satisfy the structural syntax criteria identi ed in an earlier section Is the requirement consistent with system terminology used: 1. Throughout the speci cation 2. Among speci cations within the speci cation tree 3. By the Acquirer and User Does the requirement contain any terms that require scoping de nitions Does the requirement make assumptions that should be documented in the Notes and Assumptions section of the speci cation Does this requirement con ict with another requirement Is the requirement stated objectively and avoids subjective compliance assessments Is the requirement stated in language that accurately bounds the subject capability and level of required performance (continued)
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