What a kanban card is
Kanban is Japanese for a signboard or visual signal. In Toyota's production system, a kanban card was a physical signal to make or deliver more parts: when a bin of parts ran out, its card went back upstream to ask for more. Factories and warehouses still use kanban cards this way to restock inventory.
In knowledge work, a kanban card is one piece of work on a board. It moves from column to column as the work moves, so anyone can see what's waiting, what's in progress and what's done without asking.
What to put on a card
Always:
- A title that says what will be different when the card is done.
- An owner, once someone starts it.
When it helps:
- A description with the context someone needs to start: why it matters, links, and what done looks like.
- A checklist for the steps, so progress shows without opening the card.
- A due date, only if the date is real. A board where every card has a date makes the dates mean nothing.
- A priority for the few cards that must jump the queue.
- A size, if the team plans sprints or wants to spot cards that are too big.
- Tags for the area or customer it belongs to.
Decisions, questions and files go on the card too, as comments and attachments, so they aren't lost in a chat thread.
Writing a good card title
A good title describes the outcome, in words someone outside the team would understand, short enough to read on the board.
- Weak: "Login"
- Better: "Sign in with Google"
- Weak: "Look into slow page"
- Better: "Pricing page loads in under 2 seconds"
- Weak: "Email stuff"
- Better: "Send the welcome email after sign-up"
Start with a verb or describe the end state. Avoid titles that only make sense to the person who wrote them.
How big should a card be?
Small enough to finish in a few days. Large cards wait longer, hide more surprises and sit in In Progress for weeks, which makes the board look busy while nothing finishes.
If a card would take more than a week, split it by outcome: what could be finished and shown on its own? "Billing page" might become "Show the current plan", "Change plan" and "Download invoices". A checklist covers the steps inside one card; separate cards cover separate outcomes.
Classes of service
The Kanban Method describes 4 classes of service: kinds of card that move through the board under different rules.
- Expedite: urgent work that goes ahead of everything else, like a production outage. Allow very few at once.
- Fixed date: work with a real deadline, like a contract date or a launch. It gets pulled early enough to make it.
- Standard: most work. First in, first out, in priority order.
- Intangible: work with no deadline that still matters, like paying down technical debt. It fills the gaps.
On a board, these are usually shown with a colour, a tag or a priority, so everyone can see which rules apply to a card at a glance.
Common card mistakes
- Cards as reminders. "Think about pricing" never moves. Make it a decision: "Choose the Pro price".
- One card, many outcomes. If a card needs a long checklist of unrelated items, it's several cards.
- Hidden blockers. A card waiting on someone should say so, with a comment or a Waiting column.
- Cards nobody owns. Once work starts, every card in progress needs a name on it.
- Dead cards. Archive what you'll never do. A shorter board is easier to trust.
Cards in craaft
A craaft card holds a title and description, an assignee, a due date, a priority from low to urgent, a size, tags, a checklist, and threaded comments with @mentions. On Pro, cards hold files too. Its activity log records every move and change, with who made it and when.
- Use the urgent priority for expedite cards, and a due date for fixed-date ones.
- Tags mark the area or customer a card belongs to, and the board filters by them.
- Focus flags cards that need tidying: no details, untouched for 2 weeks, or yours without a date.
- Press P on a card to copy it, with its checklist, newest comments and the board's brief, as a prompt for Claude, Cursor or any chat window.
Start with the kanban board template, or see kanban board examples for the columns other teams use.
Questions
What is a kanban card?
One piece of work on a kanban board. It moves from column to column as the work progresses, so the whole team can see where everything is. In manufacturing, a kanban card is a physical signal to restock parts.
What information goes on a kanban card?
At least a clear title and, once work starts, an owner. Add a description, checklist, due date, priority or tags only where they help someone do or find the work.
How big should a kanban card be?
Small enough to finish in a few days. Split anything that would take more than a week into cards that can each be finished and shown on their own.
What do the colours on kanban cards mean?
Whatever the team agrees. Many teams use colour or tags for classes of service, such as expedite or fixed date, or for the kind of work, such as a bug or a feature.