Search results
Results from the WOW.Com Content Network
The scope constraint refers to what must be done to produce the project's end result. These three constraints are often competing constraints: increased scope typically means increased time and increased cost, a tight time constraint could mean increased costs and reduced scope, and a tight budget could mean increased time and reduced scope.
Software requirements [1] for a system are the description of what the system should do, the service or services that it provides and the constraints on its operation. The IEEE Standard Glossary of Software Engineering Terminology defines a requirement as: [2]
In order to meet these criteria, success factors/risks and constraints are fundamental. They define the: vision, objectives, scope and deliverables (i.e. what has to be achieved) stakeholders, roles and responsibilities (i.e. who will take part in it) resource, financial and quality plans (i.e. how it will be achieved)
Second, a constraint limits design alternatives, whereas a requirement specifies design characteristics. To continue the example, a requirement selecting a web service interface is different from a constraint limiting design alternatives to methods compatible with a Single Sign-On architecture.
Prescriptive specifications define the requirements using generic or proprietary descriptions of what is required, whereas performance specifications focus on the outcomes rather than the characteristics of the components. Specifications are an integral part of Building Information Modeling and cover the non-geometric requirements.
Strategies, tactics, policies, and constraints affecting the system; Organizations, activities, and interactions among participants and stakeholders; Clear statement of responsibilities and authorities delegated; Specific operational processes for fielding the system; Processes for initiating, developing, maintaining, and retiring the system
In systems engineering and software engineering, requirements analysis focuses on the tasks that determine the needs or conditions to meet the new or altered product or project, taking account of the possibly conflicting requirements of the various stakeholders, analyzing, documenting, validating, and managing software or system requirements.
In each area, similar questions are asked; what are the goals, what are the constraints, what are the current tools or processes in place, and so on. Only when these requirements are well understood can functional requirements be developed. In the common case, requirements cannot be fully defined at the beginning of the project.