votes. Project trade offs means that in case one (or more than one) constraint is no longer aligned with the original project plan, then the project manager will rectify the situation by playing with the remaining constraints. The decision to make a trade off is really based on the importance of each and every constraint.
The decision to make a trade off is really based on the importance of each and every constraint. For example, some projects have a fixed deadline that is impossible to change, other projects may have a tight budget that they can never exceed, while the remaining projects have a scope that should never be altered. The importance of constraints depend on the type of the organization undertaking the project, the client, and the type of project.
In any project, you start making tradeoffs from the least important constraint, and you start playing with the most important constraint only when your project is in a desperate situation.