This is an excellent, dense summary of some key productivity practices from Stephen Covey’s Principle Centered Leadership. I count 9 practices here:
Highly effective people carry their agenda with them. Their schedule is their servant, not their master. They organize weekly, adapt daily. However, they are not capricious in changing their plan. They exercise discipline and concentration and do not submit to moods and circumstances. They schedule blocks of prime time for important planning, projects, and creative work. They work on less important and less demanding activities when their fatigue level is higher. They avoid handling paper [and email!] more than once and avoid touching paperwork [and email!] unless they plan on taking action on it.