SE Concept
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چکیده
Specification of the context in which the system will operate, the purposes of the system, what operations the system must perform, and what quality of service the system must provide in achieving those purposes and rendering those services. A statement of properties that a system shall exhibit or shall not exhibit when completed. Note: requirements are derived from requirements in a many-to-many relationship. (Needs) Stakeholders have needs, or uses for the system. These become expressed as requirements. Specifies the desired behavior, structure, and/or properties of a system/element/component. Requirements are captured as EDOC models. EDOC is a specification language compliant with ISO/IEC Standard 10746, Reference Model of Open Distributed Processing, RM-ODP. Requirements are captured in five viewpoints. The Enterprise, Information, and Computation viewpoints capture technology-independent (PIM) specifications using EDOC's Enterprise Collaboration Architecture. The Engineering and Technology viewpoints capture platform-specific (PSM) models. Functional requirements Specification of the functional areas in which the system must provide services, definition of what those services are, and what products are consumed and produced by those services. A requirement which specifies the functions the system /element/ component performs, its inputs and outputs, and the temporal ordering of the functions. System functional blocks are defined using EDOC Components. There are two kinds of EDOC Components, Process Components and Community Processes. Components can be nested to provide a functional decomposition of the system specification. Non-functional requirements Specification of the characterisitcs and qualities of the products provided by the system, performance characteristics for the services rendered, and applicable design constraints. Specification of what elements from the constituent disciplines (hardware, software, database, facilities, and operations) constitute the system and the relationships (interfaces) between these elements. A requirement other than functional requirements, including performance and physical requirements, and design constraints. Policy statements in the Enterprise viewpoint models. Includes Environment Contracts and Quality of Service specifications. Environment contracts relate to performance, throughput, reliability, etc.
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