Planning and Scrum are not incompatible, but the particulars of when to plan and how much to plan at once change quite a bit when switching to Scrum. Publishers and developers cannot replace detailed plans and schedules with anything but frequent communication.Long term agile planning has been greatly enhanced by the practices that Mike Cohn has introduced in his book Agile Estimating and Planning, and in the courses he provides through Mountain Goat Software. These practices give teams additional tools to apply in predicting how much work can be done further out in the future, while still allowing an agile project to introduce change.