System Operational Capability Derivation and Allocation in .NET

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System Operational Capability Derivation and Allocation
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the potential to perform an action. In contrast, an operational capability may integrate several physical system capabilities to produce a speci c outcome to achieve a mission objective.
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21.2 CONCEPT OVERVIEW
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To better understand how system operational capability derivation and allocation are performed, let s establish the relationships between the organizational mission and the system. Figure 21.1 provides a graphical framework. Organizational Roles and Mission Objectives (1) are accomplished by MISSION SYSTEM Operations (3) synchronized with a Mission Event Timeline (MET) (2). MISSION SYSTEM operations (3) interact with the OPERATING ENVIRONMENT system elements (4). During these interactions MISSION SYSTEM Operations (3) consist of Phases of Operation (5), each of which may consist of several Modes of Operation (6). For the MISSION SYSTEM to perform its operations (3), it must provide System Operational Capabilities (7). Each of these capabilities is translated into System Performance Requirements (8) that are allocated to applicable MISSION SYSTEM elements (9) (PERSONNEL, EQUIPMENT, etc.). The system s stakeholders may also identify Design and Construction Constraints (10) that are levied on one or more System Performance Requirements (8). System Performance Requirements (8), allocated to the MISSION SYSTEM elements (9), are used to formulate and select the MISSION SYSTEM and the System Architectural Con guration(s) (11) of the system element level. System Performance Requirements (8) are then allocated to each selected System Architectural Con guration (11). Each System Architectural Con guration (11) is veri ed against the System Performance Requirements (8) to formally demonstrate that the requirements have been satis ed. Based on this framework, let s begin with our rst discussion topic, identifying and deriving system operational capabilities.
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1 Organizational Roles & Mission Objectives 2 Mission Event Timeline
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Bounded by Accomplished by Constrained by Partitioned into
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5 Phases of Operation
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Consists of
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6 Modes of Operation
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3 MISSION SYSTEM Operations
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7 System Operational Capabilities
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4 OPERATING ENVIRONMENT System Elements
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8 System Performance Requirements
Allocated to
9 MISSION SYSTEM Elements
Consists of
10 Design & Construction Constraints
Levied on
Allocated to Levied on
System Architectural Configuration(s)
Figure 21.1 System Operational Capability Derivation & Allocation
21.3 Required Operational Capabilities
21.3 REQUIRED OPERATIONAL CAPABILITIES
Every use case represents an application of the system, product, or service employed by the End User to conduct organizational missions, operations, or tasks. Therefore, each use case represents a required operational capability (ROC). Use cases often express very broad, general statements of User expectations. These expectations require clari cation via analytical WHAT IF scenarios. Consider the following example:
EXAMPLE 21.1
Suppose a use case characterizes a required operational capability for a DVD player to respond to user commands when a DVD is inserted. WHAT IF the user inserts a single-sided DVD upside down
As illustrated earlier in Figure 17.1, use case scenarios represent HOW the User might apply, use, misuse, or abuse the system, product, or service. As such, a use case scenario may motivate System Developers to specify lower level required operational capabilities mandating: 1. A warning or caution to the User about an unacceptable, dangerous, or hazardous action, safety violation, or condition and request a decision. 2. Automatical correction of the problem, if practical. Therefore, the system design must be suf ciently robust to respond to the action or condition without failure or degraded performance. This is why we organize this information and relationships as illustrated in Figure 21.2. Note how each cell representing a logical physical relationship has its own unique identi er. Ultimately, the required operational capabilities will be translated into singular SPS or item development speci cation (IDS) requirements statements.
Where:
# = Reference to description
System Phases of Operation
Pre-Mission Mission Post Mission MISSION SUPPORT MISSION SUPPORT MISSION SUPPORT SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM Elements Elements Elements Elements Elements Elements
1 7 13 19 25 31 37 43 49 55 61 67 73 79 2 8 14 20 26 32 38 44 50 56 62 68 74 80 3 9 15 21 27 33 39 45 51 57 63 69 75 81 4 10 16 22 28 34 40 46 52 58 64 70 76 82 5 11 17 23 29 35 41 47 53 59 65 71 77 83 6 12 18 24 30 36 42 48 54 60 66 72 78 84