When you put all the possible working schedules, habits and systems on a graph, the graph will show all your productive possibilities.

• If we're below the frontier, we can make more improvements without facing trade-offs. We might choose to work less while keeping our workload constant.
• On the frontier, we can only improve by accepting trade-offs. Choosing an ambitious career move may make us work nights and weekends.

The frontier is always a bit deceptive. Finding a new technique can suddenly let you get much more done in less time. The frontier can shift.

Guidelines to know if you are on the frontier:

• You've read and applied a lot of productivity advice.
• When you look in your schedule, there aren't many things you could easily cut.
• Making an effort to do more inevitably cause a setback in other areas of life.

Those that are far from the frontier can focus on improving each element. You can improve by reorganizing your work to get more done.

But once you are on the productive frontier, things are different. Improvement comes from making hard choices about trade-offs. Do you want a cleaner house or more time to work on your projects? You may feel guilty for investing more time on one thing while limiting time for something else important. It is best to be intentional about what you really care about and what can be downgraded.