There is a fundamental relationship between schedule duration, amount of work and quality. If estimates were all accurate, then the amount of work and the spri

There is a fundamental relationship between schedule duration, amount of work and quality. If estimates were all accurate, then the amount of work and the sprint duration would be the same. It inevitably takes more work than estimated, so something has to give. If you constrain the duration and the scope of work, then quality will vary. If you constrain the duration and allow overtime, then you get a mini crunch time every two weeks. Some bosses think that people will slack off unless they are given pressure, so they like this situation. A better way is Kanban. It's more or less Scrum where quality is the thing that's fixed. If the task is going to make more time than originally estimated, either you let it take more time or reduce the size of the feature, i.e. implement a simpler version of it.