How to keep an idea journal (and actually use what's in it)

What is an idea journal?

An idea journal (also called an idea notebook, idea log, or idea diary) is one place where every idea you have goes, the moment you have it, whether it's big or small, good or bad. It isn't a diary of your day, and it isn't a to-do list. It's a holding pen for possibilities: the business you might start, the story you might write, the thing you wish existed.

The point of an idea journal isn't the writing. It's the finding. An idea you wrote down but can never find again is as lost as one you never wrote down.

Why keep one

• Ideas show up at bad times. In the shower, at 3 a.m., halfway through a meeting. If there's no fast, obvious place to put them, they're gone in minutes.
• Most ideas need company. One idea on its own is often half an idea. Months later, two half-ideas in the same journal turn out to be one good one.
• It takes the pressure off. When you trust that an idea is saved, you stop rehearsing it in your head and can get back to what you were doing.
• It shows you what you care about. Read a year of your own ideas and patterns appear: the topics you keep circling back to are telling you something.

Paper or digital?

Both work. The best idea journal is the one you'll actually have with you when an idea arrives.

Plenty of people do both: a small paper notebook for sketching, and their phone for everything else. If you do, pick one place as the home and move paper ideas there once a week.

How to set up an idea journal

1. Choose one home. One notebook or one app. Ideas spread across five places are the problem you're trying to solve.
2. Make capture take less than ten seconds. Pocket notebook and pen, or an app one tap from your home screen. If writing an idea down feels like a chore, you'll skip the small ones, and the small ones are often the seeds.
3. Give every idea a date. You'll want to know when you had it, both for your own curiosity and because the date can matter later. (More on that below.)
4. Give every idea a title. A few words you'll recognize in a list: "Breakfast-only food truck," not "food idea."
5. Add a rough category. Business, story, product, event, gift, home. Categories make the journal searchable at a glance.
6. Leave room to grow. On paper, leave the facing page blank. In an app, use something that lets an idea collect notes, links, images, and versions over time.

What to write down

Write down everything, especially the ones that seem silly. You can't judge an idea well in the moment you have it. For each idea, the basics are enough:

• The spark: one or two sentences. What is it?
• Why it caught you: what made you think of it? A problem you hit, something you saw, a conversation?
• The first next step, if one is obvious: who to ask, what to look up, what to try.

You don't need all three. A title and one line beats a perfect entry you never got around to writing.

Some prompts if the page is blank:

• What annoyed you this week that someone should fix?
• What do you wish existed?
• What would you make if you knew it couldn't fail?
• What do you keep explaining to people? (That might be a book, a class, or a video.)
• What did you love as a kid that nobody makes anymore?
• What would you build with three friends and a free weekend?

The part most people skip: reviewing

An idea journal you never read is just a nicer graveyard. Schedule a short review, and it becomes a pipeline.

• Weekly (10 minutes): read the new entries. Add a line to anything that's still interesting. Move paper ideas into your main home.
• Monthly (30 minutes): read everything since last month. Star the ideas you're still thinking about. Look for two ideas that might really be one.
• Yearly: read the whole journal. You'll be surprised which ideas aged well, and which you've already half-built without noticing.

How to pick which idea to work on

Having lots of ideas is good. Trying to build all of them at once is how none of them get finished.

Ask four questions of each starred idea:

1. Do I keep coming back to it? Ideas you think about unprompted for weeks have earned a look.
2. Can I make a small version soon? A first step you could take this month beats a perfect plan for next year.
3. Do I have, or can I get, what it needs? Skills, people, money, time.
4. Would I be proud of it even if it didn't take off?

Then limit your active ideas. Pick a small number, three to seven, to actively work on, and let everything else rest in the journal. Resting isn't failing. The ideas are safe and waiting. When an active idea finishes or stalls, promote the next one.

That's the core of how Idea Baby Daycare works: you capture everything, and give a Room to the few ideas you're actively raising. You can keep up to seven ideas Alive at once, and the rest nap safely until you're ready.

Old ideas about idea journals

People have been doing this for centuries, and two traditions are worth borrowing from:

• The commonplace book. For hundreds of years, readers and writers kept a single book of quotes, facts, and thoughts worth remembering, often organized under headings so they could find things again. The philosopher John Locke even published a method for indexing one. The lesson: organize for retrieval, not just storage.
• The spark file. The writer Steven Johnson described keeping one running document of half-formed ideas, which he rereads every few months. The lesson: the value comes from rereading, when old hunches meet new knowledge.

A real one: 200+ ideas, and finally building one

"I have 200+ ideas. Here's how I finally started building one." Jason, Idea Baby Daycare

For years, Jason's ideas and scripts lived everywhere: his laptop, the cloud, backup accounts, external hard drives. Getting them into one place was the first step. Picking one to raise was the second. One of those ideas became a screenplay, Whistling Boy in the Graveyard, now nearly finished. You can see the idea, or browse our short film ideas to see what a page of raised ideas looks like.

When an idea needs a "when"

Sometimes it matters when you had an idea, for example before pitching it to someone. A dated journal entry is a start. A paper notebook with dated, consecutive pages is better than loose notes. Digital tools can do more: in Idea Baby Daycare, every idea you capture gets a timestamped, cryptographically signed receipt of its original title and text. Later edits never change it, and anyone can verify a public idea's receipt without an account.

Be clear about what any of this does, though: a record of when you had an idea isn't legal protection for the idea itself. If an idea has real commercial value, talk to an intellectual property lawyer.