An example of interaction between constraints may occur when you have changes to scope that in turn impact the schedule and/or budget. Scope can change through the formal change control process or through scope creep. Perhaps your project sponsor has decided you need one more deliverable in order to satisfy the overall goals and objectives of the project. This is approved in a formal change request process. However, scope changes require schedule changes, and they often require budget changes as well. The interaction here is like a domino effect, and all the constraints should be reexamined to ensure that they still accurately reflect the conditions of the project.