Respect the three-outcome limit — not two, not five

Three is enough to be purposeful and few enough to be achievable; going beyond it dilutes attention across too many focal points.

Why it works

Working memory research (Miller 1956; Cowan 2001) suggests humans reliably hold roughly three to four items in focal attention simultaneously. A three-outcome list is at the edge of what can be held in mind without external scaffolding, making it small enough to remember without a list but large enough to structure a full day. Lists of five or more require constant reference to remain active in planning — at which point the plan stops guiding behavior between check-ins.

How to do it

1. Start by generating your outcomes for the day, then select the three most important — not by importance ranking but by what would make the day feel genuinely successful.
2. If you consistently find yourself choosing five, treat that as a signal to increase scope per outcome rather than increasing the count.
3. If two outcomes genuinely cover the day, two is fine — three is a ceiling, not a mandatory count.

Evidence

Working memory capacity is consistently estimated at three to four chunks (Cowan 2001 updating Miller’s "magic 7"). A three-item list fits within this capacity; larger lists do not. The application to daily planning is mechanistic extrapolation rather than a directly tested finding. (mechanistic)

Working memory research is about active maintenance capacity in immediate tasks, not specifically about planning or goal recall over a day; the extrapolation is principled but imprecise.

Sources

• Cowan (2001), the magical number 4 in short-term memory, Behavioral and Brain Sciences

Common mistake

Treating the three as the day’s full work plan rather than its three anchor outcomes — you still have a day’s worth of other tasks; three outcomes are the navigational goals, not a complete schedule.