PREPARING THE REQUIREMENT STATEMENT in .NET

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33.4 PREPARING THE REQUIREMENT STATEMENT
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Speci cation developers often become consumed with attempting to state too many requirements at once. When you develop requirements, there is actually a three-step process that you should follow: Step 1: Focus on the capability that is to be communicated in the requirement and its supporting attributes. Step 2: Focus on the syntax of the primary contents of the requirement. Step 3: Focus on the grammar. Let s elaborate on each of these points.
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Step 1: Identify the Key Elements of the Requirement
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Earlier in this chapter we identi ed key attributes that describe the content of most requirements (source of the action, etc.). For each of these attributes, identify in short notation (verb noun form) WHAT the requirement attributes are to communicate. Consider the example shown in Table 33.1. Here we describe the fundamentals of a SYSTEM level requirement related to a car design. Notice that Table 33.1 focuses on WHAT must be accomplished; grammar comes later as illustrated in the example that follows.
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Requirements Statement Development
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EXAMPLE 33.3
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The vehicle shall have the capability to safely and comfortably transport a driver and four passengers ondemand to a destination 200 miles away during all weather conditions.
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Step 2: Develop the Draft Requirements Statement
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Humans unintentionally overcomplicate the performance and development speci cation requirements process. The formulation and development of a requirements statements involves three aspects: 1) content, 2) syntax, and 3) grammar. One of the most common problems in requirements statement development is that people attempt to perform all three of these aspects simultaneously. As a result, when you focus on syntax and grammar, you may lose focus on the content. One solution to this problem is to develop primitive requirements statements. Create Primitive Requirements Statements. Primitive requirements statements focus on the content of the requirement. The best way to develop primitives is to use a tabular approach such as the one illustrated in Table 33.2. Here, we assign a unique requirement ID SPS-136 to
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Table 33.1 Example requirements attributes de nition approach for a car-driver system Requirement Statement Attribute Required use case capability Source of the action Expected outcome/results of the action Operating environment constraints Action response time Recipient(s) of the action Format of the action Transportation Vehicle Safe and comfortable travel to/from a planned destination All weather conditions, -30 F to +130 F On-demand; immediately available Driver and four passengers Seated Requirement Contents
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Table 33.2 Table for identifying primitive requirements Requirement ID SPS-136 Capability to Be Provided Capability 24 Relational Operators Boundary Constraints, Tolerances, or Conditions 50 pounds 68 Fahrenheit 25 Celsius 6 g s 6 nautical miles (NM) 25 Hertz (Hz) 10.000 volts dc +/- 0.010 volts dc Sea state 3 12 megabytes (Mb) Notes
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Not to exceed Less than or equal to Greater than or equal to In accordance with (IAW) Not exceed And so forth
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33.5 Identifying the Requirement Veri cation Method Table 33.3 Examples of primitive requirements using the tabular approach Requirement ID SYS_1 Capability to be Provided The SYSTEM shall operate from an external power source The gross weight of the SYSTEM shall . . . The SYSTEM shall operate . . . On receipt of a command from the operator, the SYSTEM shall produce reports formatted The SYSTEM shall sense overload conditions that . . . Relational Operators Rated at Boundary Constraints, Thresholds, Tolerances, or Conditions 110 vac +/- 10%
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Notes
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SYS_123 SYS_341 SYS_426
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Not exceed Throughout a range of In accordance with
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50 pounds -10 F to +90 F +20% to +100% humidity Regulation 126 Section 3.2.1
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SYS_525
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Exceed
+10 amps dc
Capability 24, which represents a speci c use case. The remainder of the columns focus attention on substantive content such as types of relational operators; boundary constraints, tolerances, or conditions; and notes. Notice how Table 33.2 focuses on the primary content of the requirement and AVOIDS becoming mired in grammar. Once the elements of the requirements are established, the next step is to translate the contents into a syntax statement. Develop the Syntactical Statement Structure. Step 2 translates the primitive requirement into a text phrase as illustrated in Table 33.3.