Putting Speci cations into Perspective in .NET

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28.6 Putting Speci cations into Perspective
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Traceable to User Needs. Well-written speci cations should be traceable to a User s prescribed solution space and ful ll validated operational needs derived from a problem space relative to the organization s mission and objectives. Written in a Language and Terms That Are Simple and Easy to Understand. Wellwritten speci cations are written in a language that uses terms that are well de ned and are easy to understand. In general, many quali ed people should independently read any requirement statement and emerge with the same interpretation and understanding of technical performance requirements. Feasible to Implement. A well-de ned speci cation must be feasible to implement within realistically achievable technologies, skills, processes, tools, and resources with acceptable technical, cost, schedule, and support risk to the Acquirer and the System Developer or Services Provider.
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When SEs specify the items, materials, and processes required to support system, product, or service development, how is this accomplished These work products are speci ed via a hierarchical set of speci cations that focus on: 1. De ning the requirements for multi-level system items. 2. Supporting speci cations for materials and processes to support development of those items. The hierarchical set of speci cations is documented via a framework referred to as the speci cation tree. We will discuss the speci cation tree later in this section. To understand the hierarchical structure within the speci cation tree, we need to rst establish the types of speci cations that may appear in the framework. The classes of speci cations include the following: General or performance speci cations Detail or item development speci cations Design or fabrication speci cations Material speci cations Process speci cations Product speci cations Procurement speci cations Inventory item speci cations Facility interface speci cations
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Figure 28.1 illustrates the primary types of speci cations.
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To place all of these various types of speci cations into perspective, let s use the example illustrated in Figure 28.2. Requirements for a SYSTEM, as documented in the System Performance Speci cation (SPS), are allocated and owed down one or more levels to one or more items such
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System Speci cation Practices
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System Performance Specification (SPS)
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Consists of
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Where: = One-to-Many entity Relationship = May or May Not Consist of
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Item Development Specifications
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Facility Specifications
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Product Specifications
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Process Specifications
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Material Specifications
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Fabrication Specifications Design
Requirements/ Assembly Requirements
Figure 28.1 Entity Relationships of for Various types of Speci cations
System Performance Specification (SPS)
Supported by Supported By
Item Development Specifications
Item Design/ Item Design/ Fabrication Fabrication Specifications Specifications
Item Product Item Product Specifications Specifications
Item Procurement/ Development Process
Fabrication Coding Assembly Inspection Test
Supported By
Item Process Item Process Specifications Specifications Item Material Item Material Specifications Specifications
Supported By
Supports Review and Coordination Supports
Supported By
Item Facility Item Facility Specifications Specifications
Facility(s) Development
Figure 28.2 Application of Various Types of Speci cations to Item Development
28.7 The Speci cation Tree
as PRODUCTS, SUBSYSTEMS, ASSEMBLIES. Requirements for these items are captured in their respective development or procurement speci cations that document the As Speci ed con guration. As the highly iterative, multi-level, and recursive design effort evolves, SEs develop one or more design or fabrication speci cations to capture the attributes and characteristics of the physical PARTS to be developed. In the design effort one or more process speci cations and material speci cations are developed to aid in the procurement, fabrication, coding, assembly, inspection, and test of the item. The collective set of baselined speci cations represent the As Designed Developmental Con guration that documents HOW to develop or procure the item. The set of speci cations generated for each item or con guration item (CI) serve as the basis for its development, as well as facilities, either internally or via external subcontractors or vendors. When the CI completes the System Integration, Test, and Evaluation (SITE) phase that includes system veri cation, the As Veri ed con guration is documented as the product baseline and captured as the CI s product speci cation.
The multi-level allocation and ow down of requirements employs a hierarchical framework that logically links SYSTEM entities vertically into a structure referred to as the speci cation tree. The right side of Figure 28.3 provides an example of a speci cation tree.
Speci cation Tree Ownership and Control
The speci cation tree is typically owned and controlled by a program s Technical Director or a System Engineering and Integration Team (SEIT). The SEIT also functions as a Con guration Control Board (CCB) to manage changes to the current baseline of a speci cation.