The team-level taxonomy guide on this shelf covers designing categories that inform a specific decision rather than exhaustively describing every kind of work. The same principle applies, with a slightly different set of pressures, to a personal taxonomy — the categories one person uses to track their own time, without the team-reporting or billing requirements that shape a professional system.
The specific failure mode of a personal taxonomy
A personal time-tracking system built during an ambitious, organized moment — often at the start of a new year or after reading a book on the subject — tends to start with far more categories than the ones described in the team-taxonomy guide, because a personal system has no other stakeholder to push back on unnecessary complexity. Without a manager or a billing requirement forcing simplicity, a personal taxonomy tends to grow until it collapses under its own detail, usually within a few weeks, once the initial motivation that justified the extra categorization effort fades.
The most durable personal taxonomies tend to converge, after some trial and error, on a small number of categories that map to a genuine ongoing question the person actually cares about answering — how much time goes to deep, focused work versus reactive tasks, for instance, or how the week's actual hours compare to the plan, connecting to the plan-versus-log guide on this shelf — rather than an exhaustive breakdown of every activity performed. For a practical software example related to self-reporting bias, read the full guide.
Letting the taxonomy evolve instead of designing it once
A personal taxonomy is easier to get right through iteration than through upfront design, precisely because the question a person actually cares about tracking often only becomes clear after a few weeks of rough, imperfect logging reveals what's actually interesting or surprising in the data. Starting with a deliberately minimal set of categories and adding a new one only when a specific recurring activity keeps getting awkwardly forced into an existing category — rather than trying to anticipate every category needed from the start — tends to produce a system that fits the person's actual life rather than a generic template.
- Start with three to five categories at most for a first attempt — resist the urge to fully specify the system before using it.
- Add a category only when an existing one keeps feeling wrong for a recurring activity — let the data reveal gaps rather than guessing them upfront.
- Revisit the taxonomy at a natural checkpoint (monthly, discussed in the monthly retrospective guide on this shelf) rather than adjusting it continuously, which prevents meaningful week-to-week comparison.
- If a category hasn't been used in a month, remove it — an unused category is silent evidence it wasn't actually answering a question worth tracking.
What a lasting personal taxonomy is ultimately for
The point of a personal time-tracking taxonomy isn't completeness — a fully accurate account of every minute of a life is neither achievable nor useful — it's giving a small number of ongoing, personally meaningful questions a reliable way to get answered over months, in a form simple enough to actually maintain that long. A taxonomy that a person is still using after six months, even a minimal one, has produced more real insight than an elaborate one abandoned after three weeks.
This closes the loop with the categories-that-help guide on this shelf: the same discipline that keeps a team's taxonomy useful — fewer categories, chosen for a specific question — applies just as much, and arguably more, to a personal system with no external pressure to keep it simple. For additional background on this subject, consult RescueTime.