The to-do list is probably the most universal productivity tool there is. Paper, app, sticky note, the back of an envelope — almost everyone uses some version of it.
And almost everyone runs into the same problem with it: at some point, the list stops helping and starts to weigh on you. More items get added than crossed off, and looking at it starts to feel less like a plan and more like a reminder of everything you haven’t done.
The usual explanation is that there’s just too much to do. But that’s often not really it. The actual problem is that everything is sitting in the same place, with no distinction between context, urgency, or area of life — and a single list was never built to hold all of that at once.
The problem with a single to-do list
A single to-do list mixes things that have nothing to do with each other: a work deadline next to a grocery run, a personal project next to a family commitment, something urgent next to something that matters but isn’t going anywhere today.
The result is a list that’s technically complete but practically hard to use:
- When you’re working, seeing household tasks on the same list is a distraction — or a quiet source of guilt.
- When you’re at home, seeing work tasks pulls you straight back into work mode.
- When you try to prioritize, comparing “finish the presentation” with “buy milk” doesn’t really mean anything — they’re not the same kind of thing, and ranking them against each other doesn’t tell you much.
Part of this is just how attention works: every time your eyes move from one kind of task to a completely different one, there’s a small cost of re-orientation before you can actually engage with it. A mixed list produces that cost constantly — even just looking at it, with no intention of doing anything yet. Getting things out of your head and onto a page is supposed to lower that load, but if everything lands in the same undifferentiated place, part of the load just moves from your head to the page.
What “organizing by topic” actually means
Organizing by topic doesn’t mean using a different app for every part of your life. It means separating tasks by context within the same system.
The basic idea: one list per context you can actually be in at a given time — work, home, personal projects, health, family — instead of one list trying to hold all of them at once.
What changes when you do this:
- When you’re in work mode, you see work tasks — nothing from the other contexts competing for attention.
- When you’re dealing with things at home, that’s all that’s in front of you — work doesn’t bleed in.
- When you prioritize within a list, you’re comparing things that are actually comparable, which is the only way prioritizing means anything.
The separation doesn’t need to be perfect or exhaustive. Three or four main contexts are usually enough to make the difference noticeable — the goal isn’t a complete map of your life, just enough structure that each list only contains things that belong together.
How many topics is too many
The most common mistake when setting this up is creating too many categories.
Past five or six distinct areas, the system starts to reproduce the original problem: too many places to look, too many decisions about where something belongs before you can even write it down.
A more useful question than “which category does this fit into” is “what context will I actually be in when I do this.” That tends to produce somewhere between three and five natural categories for most people — not because that’s a rule, but because that’s roughly how many distinct contexts most people’s lives actually have.
The original version of this article suggested keeping any list under 15 tasks, and that’s still a reasonable ceiling. But the number matters less than the consistency of the list — twelve things from the same context beat eight that don’t belong together.
Topics that connect tasks and notes
There’s a more useful version of this system that goes beyond separating tasks.
When the same topic groups both the tasks for that area and the notes, entries, and reflections about it, the system stops being just a list and becomes something closer to a full context.
Take a “work” topic, for example. It’s not just the open work tasks — it’s also the notes from meetings, the reflections on how a project is going, what worked and what didn’t on something similar last time.
That changes how you plan. Instead of planning from an abstract list of pending items, you’re planning from everything you actually know about that area: what’s open, what you’ve already learned, what’s still unresolved from last week.
It’s the difference between a task manager and an actual working space for that part of your life.
This is what idazery’s Topics do: they group diary entries and planner tasks by the same area of life, so work, a specific project, your health, or your family each get their own space — with everything related to that area in one place. It’s a practical version of a journal and planner built around the same contexts.
Practical examples of useful topic structures
There’s no single correct structure — it depends on how your life is organized. But a few patterns work well for most people.
If work and personal life are clearly separate:
- Work — professional tasks, projects, deadlines.
- Home — household and family management.
- Personal — health, personal development, hobbies.
- Someday — things you want to do, with no current urgency.
If you’re juggling several active projects:
- One topic per active project (three or four at most).
- Personal — everything that isn’t part of a project.
- Admin — appointments, errands, paperwork.
If you’re in the middle of a transition — a new job, a move, a major life change:
- One topic for the area in transition, with everything specific to it.
- Routine — whatever stays the same while everything else changes.
- Everything else — no fixed structure yet, just a place to capture things.
The most useful rule when you’re not sure where something belongs: don’t create a new topic until you’ve put at least five things in it. If it doesn’t reach five, it probably doesn’t need its own space yet.
When to review your topic structure
A topic structure isn’t permanent — it should change as your life does.
Once a month, or whenever things start feeling cluttered again, it’s worth a quick review:
- Any topic with just one task in it? It can probably be folded into another.
- Tasks that don’t fit anywhere? That might mean a context is missing from your structure.
- Topics you never open? Either they’re not really an active context, or their tasks belong somewhere else.
A ten-minute review every few weeks keeps the system useful without turning it into a project of its own. A weekly planning review is a natural place to fold this in — the same habit that keeps your week realistic can keep your topics realistic too.
The connection between topics and the done list
A topic system works best when it also tracks what got finished, not just what’s still open.
Seeing what you’ve completed within each topic tells you something a pending list can’t: which areas you’re actually making progress in, which ones tend to accumulate tasks without resolving them, and whether the balance between contexts is the one you actually want.
That turns a topic system from an organizing tool into something closer to self-knowledge about how your time really gets used. Keeping a done list alongside your topics is what makes that visible — and the same principle applies directly to work, where seeing what you’ve actually finished in a given area says more about your year than any task list ever does.
A single to-do list doesn’t fail because you’re disorganized. It fails because it mixes contexts that your attention handles differently — and asks one flat list to do a job it was never designed for.
Organizing by topic isn’t a complex system. It’s just giving each part of your life the space it needs, instead of asking one list to hold all of them at once.
idazery builds this in directly: Topics group both your diary entries and your planner tasks by area, so each context comes with everything that belongs to it already attached.
If you want to combine task organization by context with daily reflection and weekly review in the same space, here’s how idazery works for productive people.
Ready to organize by topic?
idazery groups your diary entries and planner tasks into Topics, so each area of your life gets its own space with everything that belongs to it in one place. Start free, no credit card required.
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