Constraint

Constraint is a factor that limits the options for managing a project, program, portfolio, or process.

Definition

According to the PMI Lexicon of Project Management Terms,

Constraint. A factor that limits the options for managing a project, program, portfolio, or process.

According to the BABOK Guide (3rd edition),

Constraint (business analysis). An influencing factor that cannot be changed, and that places a limit or restriction on a possible solution or solution option.

According to Cost Accounting by Horngren, Datar, Rajan (14th edition),

Constraint. A mathematical inequality or equality that must be satisfied by the variables in a mathematical model.