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A restriction on the value of an attribute or the existence of any object based on the value or existence of one or more others. [ ISO/IEC 15474-1 ]
Constraint [ IEEE 1362 ]: An externally imposed limitation on system requirements, design, or implementation or on the process used to develop or modify a system.
Constraint [ IEEE 1490 ]: The state, quality, or sense of being restricted to a given course of action or inaction. An applicable restriction or limitation, either internal or external to a project, which will affect the performance of the project or a process. For example, a schedule constraint is any limitation or restraint placed on the project schedule that affects when a schedule activity can be scheduled and is usually in the form of fixed imposed dates.
Constraint [ IEEE 1233 ]: A statement that expresses measurable bounds for an element or function of the system.