Budget commitments on two dimensions
Track both time cost (hours per week) and cognitive cost (mental bandwidth on 1-5 scale) for each active commitment when budgeting capacity.
Why This Is a Rule
Time-based capacity budgeting misses the most important constraint: cognitive bandwidth. A 1-hour weekly meeting that requires no preparation and produces no follow-up costs 1 hour of time and near-zero cognitive bandwidth. A 1-hour weekly meeting with a difficult stakeholder that requires strategic preparation and produces anxiety-laden follow-ups costs 1 hour of time and 4/5 cognitive bandwidth — consuming mental resources far beyond its calendar footprint.
Tracking only time produces misleading capacity estimates: "I have 10 hours of uncommitted time this week" might be true on the calendar while being false on the cognitive ledger — those 10 hours are already consumed by the cognitive overhead of your existing commitments (preparation, worry, background processing, recovery).
The dual-tracking approach — hours per week (time cost) plus 1-5 mental bandwidth scale (cognitive cost) — captures both dimensions. A commitment portfolio that sums to 35 hours and 25/50 cognitive bandwidth points has very different implications than one that sums to 35 hours and 45/50 cognitive bandwidth points. Same time, radically different cognitive load.
When This Fires
- When budgeting capacity for new commitments
- When feeling overwhelmed despite having "free time" on the calendar — cognitive load exceeds time load
- During quarterly commitment reviews when assessing which commitments to keep, modify, or drop
- Complements Audit commitments as actively chosen vs. passively… (resource audit) with the dual-dimension tracking requirement
Common Failure Mode
Time-only budgeting: "I have 5 free hours this week, so I can take on a 3-hour project." If those 5 free hours are the only recovery space in a cognitively maxed-out week, the 3-hour project doesn't cost 3 hours — it costs 3 hours plus the recovery time that was displaced, producing a net cognitive deficit that degrades performance across everything.
The Protocol
(1) For each active commitment, rate two dimensions: Time cost: hours per week consumed (including disruption footprint — Calculate activity cost as disruption footprint). Cognitive cost: mental bandwidth on 1-5 scale (1 = trivial/automatic, 5 = highly demanding/anxiety-producing). (2) Sum both dimensions across all active commitments. (3) Before accepting a new commitment, check both sums: is there remaining time capacity AND cognitive capacity? Both must have room. (4) If time is available but cognitive capacity is maxed → the new commitment would produce the "free time but overwhelmed" pattern. Decline or drop an existing high-cognitive-cost commitment first. (5) Review ratings quarterly: cognitive costs change as commitments become routine (cost decreases) or as contexts become more difficult (cost increases).