Productivity requires effective planning.
Planning requires the prefrontal cortex and therefore should be done when mental faculties are at their peak 0G3A2. Tasks should be planned in context of changing mental capacity 0G3B2, since each task affects the next 0G3B1. Earlier tasks should clear the way for later tasks by freeing mental resources by either settling a plan 0A0 or simplifying ideas to aid future work 0G3C. Schedule by focus requirements 0G3B2B.