It’s a sad fact of life.

1. You can have it Fast and Cheap but it won’t be Good.

2. You can have it Fast and Good but it won’t be Cheap.

3. You can have it Good and Cheap but it won’t be Fast.

It also works for project schedules, resources, and scope.

1. The project can be done with that many people and that deadline if you allow us to change the scope.

2. The project can be done with that many people and that scope if you allow us to change the deadline.

3. The project can be done with that scope and that deadline if you allow us to change how many people.