Furthermore, having a process defined (instead of just defining the goal) increases the chances that you'll actually do the work required to achieve your goals. It's due to the Parkinison law, every kind of work tends to fill the time we set aside for it like air fills every corner of a room (research more about the Parkinson law). So, if you plan your inputs such as writing every day from 8 AM till 10 AM you'll be more successful because you'll have a defined time in which to do the work (or let the work fill it).