The OKR (Objectives and Key Results) method helps you decide on and stick to a practical goal and then define what it would look like to have that goal completed.

Many productivity books provide various systems to organize your life but fail to take into account people who are not focused or motivated in the first place.

A meaningful goal-setting (Objective + Key Result) can be figured out by asking: 

OKR systems tell you if what you are doing is on the right track. You would need to check-in and review yourself weekly, monthly, quarterly and annual basis, checking your purpose and well as progress.