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System Levels of Abstraction and Semantics
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Table 9.1 continued Level or Tier Nomenclature (Optional) Scoping De nition 1. Level 6 or Tier 6 COMPONENTS and lower level entities. 2. Their internal SUBASSEMBLY level entity relationships. 3. The ASSEMBLY s relationships with external entities within the SYSTEM (i.e., with other ASSEMBLIES) or external systems beyond the SYSTEM s boundaries, as applicable. 6 SUBASSEMBLY Level Refers to system entities at the rst level of decomposition below the ASSEMBLY level. Each instance of a SUBASSEMBLY level entity is referred to as a Level 6 or Tier 6 system. Architectural representation of a SUBASSEMBLY Level entity includes: 1. Level 7 or Tier 7 PARTS. 2. Their internal PART level entity relationships. 3. The SUBASSEMBLY s relationships with external entities within the SYSTEM (i.e., with other SUBASSEMBLIES) or external systems beyond the SYSTEM s boundaries, as applicable. Refers to the lowest level decompositional element of a system. An architectural representation of a PART includes form factor envelope drawings, schematics, and models. Author s Note 9.2 Engineering drawings, which are produced at all system levels of abstraction, consist of two basic types: 1. Dimensional drawings or schematics for internally developed or externally procured and modi ed internally items. 2. Source control drawings that bound part parameters and characteristics for externally procured parts. For software systems, the PART level equates to a source line of code (SLOC).
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Author s Note 9.3 Hierarchical decomposition follows the same rules as outlining a report. Avoid having a single item subordinated to a higher level item. Good design practice suggests that you should always have at least two or more entities at a subordinated level. In the case of systems this does not mean that the subordinate entities must be at the same level of abstraction. For example, the Bill of Materials (BOM) meaning a parts list for a top level assembly within a product structure may consist of at least one or more SUBSYSTEMS, one or more ASSEMBLIES, and at least one or more PARTS kit (e.g., nuts and bolts). If we depict the BOM as an indentured list, the PARTS kit used to mechanically and electrically connect the SUBSYSTEMS and ASSEMBLIES into an INTEGRATED SYSTEM may be at the same level of abstraction as the SUBSYSTEMS and ASSEMBLIES. As a nal note, this text treats entities at any level of abstraction as components of the system.
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9.5 SUMMARY
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Our discussion in this chapter has introduced the hierarchical concept of system levels of abstraction and semantics. This hierarchical framework enables SEs to standardize analysis and communications about their SYSTEM OF INTEREST (SOI). The intent of a semantics convention is to synchronize members of a System Developer s team, the Acquirer, and the User on a common set of terms to use in communicating complex hierarchies.
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End User s System SYSTEM Level (System of Interest) SEGMENT Level
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Tailored System Levels Level 0 Level 1 Level 2 Level 3 Tailored Level 4 Level 5 Level 6 Level 7
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ASSEMBLY Level
ASSEMBLY Level
COMPONENT Level
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Level 3 Level 4
PART Level
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Figure 9.3 System Levels of Abstraction and Tailoring Example
SYSTEM SYSTEM
System Hierarchical Decomposition
SEGMENTS SEGMENTS
PRODUCTS PRODUCTS
SUBSYSTEMS SUBSYSTEMS
ASSEMBLIES ASSEMBLIES
System Integration
Where: = Composition = Consists of = May or may not consist of
SUBASSEMBLIES SUBASSEMBLIES
PARTS PARTS
Figure 9.4 System Decomposition/Integration Rules
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System Levels of Abstraction and Semantics
Table 9.2 System entity decomposition and integration rules Level or Tier 0 Entity User Level Entity Decomposition/Integration rules The User s SYSTEM is bounded by its organizational mission and consists of the system element assets required to accomplish that mission within its OPERATING ENVIRONMENT. Each instance of a SYSTEM consists of at least two or more instances of SEGMENT, PRODUCT, SUBSYSTEM, ASSEMBLY, SUBASSEMBLY, or PART level entities or combinations thereof. If the SEGMENT level of abstraction or class is applicable, each SEGMENT level entity consists of at least two or more instances of PRODUCT, SUBSYSTEM, ASSEMBLY, SUBASSEMBLY, or PART level entities or combinations thereof. If the PRODUCT level of abstraction or class is applicable, each instance of a PRODUCT level entity consists of at least two or more instances of SUBSYSTEM, ASSEMBLY, SUBASSEMBLY, or PART level entities or combinations thereof. If the SUBSYSTEM level of abstraction or class is applicable, each instance of a SUBSYSTEM level entity consists of at least two or more instances of ASSEMBLY, SUBASSEMBLY, or PART level entities or combinations thereof. If the ASSEMBLY level of abstraction or class is applicable, each instance of an ASSEMBLY level entity consists of at least two or more instances of SUBASSEMBLY or PART level entities or combinations thereof. If the SUBASSEMBLY level of abstraction or class is applicable, each instance of a SUBASSEMBLY level entity must consist of at least two or more instances of PART level entities. The PART level is the lowest decompositional element of a system.