When deciding what tasks need to added to the delivery of a particular iteration of whatever is being worked on it’s often easy to overlook what won’t be included and it becomes tempting to add that nice simple little feature.
But this is scope-creep and it needs to be avoided at all costs. The best way to avoid this risk is to have a list of items that are definitely not going to be included. They might be for inclusion in the next iteration but any time that there’s the temptation to include that feature there’s a reminder (and preferably with annotations) to explain why it is not to be worked on right now.
This will help to maintain focus on the most important project goals and ensuring that we’re sticking to the design. document, deliver principle.