Constraint
A constraint is a restriction on feasible activity, such as available resource, maximum demand or a minimum contractual requirement. Translate it using consistent units and the correct inequality. A capacity maximum normally gives an upper bound, while a minimum supply obligation gives a lower bound. Constraints need not all be binding at the optimal solution. Their interpretation and uncertainty matter as much as the mathematical notation.
Worked example
Each A uses two kg and each B three kg, with 600 kg available: 2A + 3B ≤ 600. A minimum contract for 50 A requires A ≥ 50.
Common mistake
Do not reverse maximum and minimum inequalities or treat the cost of a resource as its available physical quantity.
Where it appears in your exams
| Qualification | Exam | Relationship | Period |
|---|---|---|---|
| ACCA | PM | Direct | September 2026–June 2027 |