Universal Principles of Design, Updated and Expanded Third Edition
by William Lidwell, Kritina Holden, Jill Butler
100 Iron Triangle
A model that proposes three constraints for all projects: time, cost, and scope.
The iron triangle is a project management model that proposes three governing constraints for all projects: time, cost, and scope. Time refers to the amount of time the project has to be completed. Cost refers to budget, people, and resources assigned to the project. And scope refers to the features, functionalities, and quality of the thing being developed. Altering any one of these constraints likely necessitates changes to the other two. For example, an increase in scope would likely necessitate an increase in both budget and time.1
The iron triangle is commonly introduced by the expression, You can have it good, fast, or cheap; pick two. The ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access