How work is defined
David Allen defines “work” from at least six different horizons, corresponding to different altitudes of perspective.
The GTD Horizons of Focus
HORIZON 5: Purpose and Principles
HORIZON 4: Vision
HORIZON 3: Goals and Objectives
HORIZON 2: Areas of Focus and Accountability
HORIZON 1: Projects
GROUND: Calendar/Actions
Your priorities are determined from the top down—i.e. your purpose and values will drive your vision of the purpose being fulfilled, which will create goals and objectives, which will frame areas of focus and accountability. All of those will generate projects which will require actions to get them done.