I don't agree, part of decomposing into tasks is to get more accurant during the planning. To me Agile brings 3 levels of planning: release, iteration & daily where accurancy increases along the way: release = epics/themes/stories; iteration = Tas...
Alan, if all incoming stories/tasks are about the same size we could call it 'flow' as mentioned in Lean and indeed use some more Kanban style within the scrum implementation. But I think this takes a while to get there, depending on the organizat...