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The requirement is a concern of a particularly influential stakeholder. The requirement has a first-of-a-kind character, e.g. none of the responsibilities of existing components in the architecture address it. The requirement has QoS/SLA characteristics that deviate from those already satisfied by the evolving architecture.
Within systems engineering, quality attributes are realized non-functional requirements used to evaluate the performance of a system. These are sometimes named architecture characteristics, or "ilities" after the suffix many of the words share. They are usually architecturally significant requirements that require architects' attention. [1]
Architectural requirements Architectural requirements explain what has to be done by identifying the necessary integration of system structure and system behavior, i.e., system architecture of a system.
"Formalize Components Requirements – Contracts for Development and IVVQ", The fifth and last step is a contribution to EPBS (End-Product Breakdown Structure) building, taking benefits from the former architectural work, to enforce components requirements definition, and prepare a secured IVVQ.
Broadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be.Functional requirements are usually in the form of "system shall do <requirement>", an individual action or part of the system, perhaps explicitly in the sense of a mathematical function, a black box description input, output, process and control ...
Architectural decisions influence and impact the non-functional characteristics of a system. Each architectural decision describes a concrete, architecturally significant design issue (a.k.a. design problem, decision required) for which several potential solutions (a.k.a. options, alternatives) exist.
Conceptually, requirements analysis includes three types of activities: [citation needed] Eliciting requirements: (e.g. the project charter or definition), business process documentation, and stakeholder interviews. This is sometimes also called requirements gathering or requirements discovery.
ISO/IEC/IEEE 42010:2011 defines requirements on the description of system, software and enterprise architectures.It aims to standardise the practice of architecture description by defining standard terms, presenting a conceptual foundation for expressing, communicating and reviewing architectures and specifying requirements that apply to architecture descriptions, architecture frameworks and ...