TYPES OF OPERATIONAL REQUIREMENTS in .NET

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29.5 TYPES OF OPERATIONAL REQUIREMENTS
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When speci cation developers derive and develop requirements, human tendencies naturally focus on the SYSTEM operating ideally meaning normally and successfully. In the ideal world this may be true, but in the real world systems, products, and services have nite reliabilities and life cycles. As such, they may not always function normally. As a result, speci cations must specify use case requirements that cover phases and modes for a prescribed set of OPERATING ENVIRONMENT scenarios and conditions.
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Phases of Operation Requirements
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Systems, products, and services perform in operational phases. As such, SEs must ensure that the requirements that express stakeholder expectations for each phase are adequately addressed. At a minimum, this includes pre-mission phase, mission phase, and postmission phase operations.
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Modes of Operation Requirements
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Each phase of operation includes at least one or more modes of operation that require a speci ed set of capabilities to support achievement of mission phases of operation objectives. If you investigate and analyze most MISSION SYSTEM operations, you will discover that the SYSTEM must be prepared to cope with four types of OPERATING ENVIRONMENT scenarios and conditions: (1) NORMAL, (2) ABNORMAL, (3) EMERGENCY, and (4) CATASTROPHIC. Let s de ne the context of each of these conditions:
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NORMAL Operations
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NORMAL operations consist of the set of MISSION SYSTEM activities and tasks that apply to SYSTEM capabilities and performance operating within their speci ed performance limits and resources. ABNORMAL Operations. ABNORMAL operations consist of a set of SYSTEM operations and tasks that focus on identifying, troubleshooting, isolating, and correcting a functional or physical capability condition. These conditions represent levels of performance that are outside the tolerance band for NOMINAL mission performance but may not be critical to the safety of humans, property, or the environment. EMERGENCY Operations. EMERGENCY operations consist of a set of SYSTEM operations and tasks that focus exclusively on correcting and eliminating a threatening, hazardous to safety, physical capability condition that has the potential to pose a major health, safety, nancial, or security risk to humans, organizations, property, or the environment.
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29.5 Types of Operational Requirements
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CATASTROPHIC Operations. CATASTROPHIC operations consist of a set of operations or tasks performed following a major SYSTEM malfunction event that may have adversely affected the health, safety, nancial, and security of humans, organizations, property, and the environment in the immediate area.
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Relationships between Operating Condition Categories
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Requirements for SYSTEM operating conditions must not only scope and bound the use case scenario or the condition but also the transitory modes and states that contributed to the conditions. To better understand this statement, refer to Figure 29.1. As indicated in the gure, a SYSTEM operates under NORMAL operations. The challenge for SEs is to derive reliability, availability, maintainability, and spares requirements to support onboard preventive and corrective maintenance operations to sustain NORMAL operations. If a condition or event occurs prior to, during, or after a mission, the SYSTEM may be forced to transition (1) to ABNORMAL operations. NORMAL operations can conceivably encounter an emergency and transition (3) immediately to EMERGENCY operations. Analytically, Figure 29.1 assumes some ABNORMAL conditions precede the EMERGENCY. During ABNORMAL operations, a SYSTEM or its operators institute recovery operations, correct or eliminate the condition, and hopefully return to NORMAL operations (2). During ABNORMAL operations, an emergency condition or event may occur forcing the SYSTEM into a state of EMERGENCY mode operations (3). Depending on the system and its post emergency health condition, the SYSTEM may be able to shift back to ABNORMAL operations (4). If EMERGENCY operations are unsuccessful, the SYSTEM may encounter a catastrophic event, thereby requiring CATASTROPHIC mode operations (6).
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Initial State
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NORMAL NORMAL Scenario Scenario Operations Operations Requirements Requirements
1 Final State ABNORMAL ABNORMAL Scenario Scenario Operations Operations Requirements Requirements
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EMERGENCY EMERGENCY Scenario Scenario Operations Operations Requirements Requirements CATASTROPHIC CATASTROPHIC Scenario Scenario Operations Operations Requirements Requirements
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Where:
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= Triggering Event = May or may not be allowable
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Figure 29.1 System Operations Requirements Coverage
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Understanding Speci cation Requirements
How Do These Categories Relate to SYSTEM Requirements
Depending on the SYSTEM and its mission applications, the System Performance Speci cation (SPS) must specify capability and performance requirements that cover these conditions to ensure the safety of humans, property, and the environment. Will you nd a section in the SPS titled NORMAL, ABNORMAL, EMERGENCY, or CATASTROPHIC operations Generally, no. Instead, requirements for these types of conditions are distributed throughout the SPS. As a matter of good practice, however, it is recommended that Acquirer and System Developers maintain some type of documentation that links SPS requirements to these conditions to ensure proper coverage and consideration.