The Triple Constraints

The tradition and modern definitions of the Triple Constraints

The Triple Constraints

Traditionally, success of a project was measured in terms of the triple contraints - Scope, Time and Cost. These were considered the primary constraints on the project. The idea was that any change in one of these constraints had to be evaluated for impact on the other two. For example, if you wanted to increase the scope, you had to evaluate the impact on time and cost. Similarly, if you wanted to cut the schedule (time), you had to evaluate the impact on scope and cost.

The modern definition of the triple constraints has been expanded to include quality, resources, risks, and customer satisfaction. Any change in one of the constraints should be evaluated for impact on all the other constraints.