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definition-Global-Constraint

Definition:

A Global-Constraint applies for a defined System Scope, unless overridden by higher Priority specifications.

Alternative Names

Concept Number: *245
English Master: Global Constraint
Synonyms, Variations & Acronyms: System-Level-Requirement

Detailing

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Illustrations

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Type

Requirements-Class
Parameter


Examples

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Notes

Note 1:Even a Global-Constraint is limited in effect by all its attached Priority information {Qualifiers, Authority, Scope (*419)}. For example, a Global-Constraint may be relative to a defined set of Stakeholders. It is not absolute for the universe of all Stakeholders. This Is-Part-Of the System Scope in its definition. For example, the Constraint may apply only to “User = School Teachers”.

Note 2: A Global-Constraint only has a Level of Authority which is specified, or implied (by Sources for example) in its Scope. It must compete for Priority with Authority, and other priority-determining specifications, throughout its Scope. It does not have higher Priority automatically, just because it is global in Scope.

Note 3: a Global-Constraint may apply to a wider Systems area than other Constraints and other Requirements. But the areas it applies to are defined by qualifiers or other suitable Parameters describing it. For example by Depends-On, Impacts, Authority.

4. Global-Constraints are often set by powerful Stakeholders and are then generally not subject to much negotiation. Of course they can be in conflict with each other, and with business needs, so they need to be examined in terms of their design consequences, costs and Product-Values. If necessary, some feedback, to the Stakeholders concerned, will be necessary, and may Result in modification, overriding or removal of the Constraint.

5. A Global-Constraint is a specification, which “draws a border” regarding Requirements or design, but which allows more specific Requirements (which can be specific Constraints on Requirements or design) to be specified inside that border. For example: ---GC[[----->>Fail-------->O

6. Global-Constraints usually consider interests, which are broader or more fundamental than a more-local project or Product (or other “Lower-Level” or “shorter-term” perspectives). For example, interests of a Product line, company Policy or national laws and customs.

7. In cases of a conflict between any Global-Constraint and any other specification, a Global-Constraint usually has a Priority, which is higher than any conflicting specific Requirement or design. But the qualifiers and other Parameters such as Authority will determine its real Priority in particular instances.


Keyed-Icons

---X [[----]Y---

X and Y are tags of Global-Constraints.

In specific instances the icons of specific synonyms such as Tolerable (->>) and Goal (->) can be applied.
The Qualifier parenthesis (“[…]”) can be used singly or together when placed on an Attribute arrow (“->, “----”)..
The open side “this side]” or “ [this side” is the direction of acceptable Attribute Levels. The


Drawn-Icons

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Defined-System-Scope
Constraint
Generic-Constraint
Requirement
Fundamental-Constraints
Local-Constraint
Local
Scope
Global-Scope
Local-Scope


History-of-Concept

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This Concept entered by Diane O'Brien.

Created by system. Last Modification: Thursday 11 of July, 2019 18:32:49 CEST by Admin (Kai).

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