What is a Pull System?
Pull System
A pull system is a way of assigning work where a person takes on a new task only once they have capacity for it, instead of having new tasks assigned to them regardless of their current load.
A pull system is a way of organizing work so that a new task starts only when someone has the capacity to take it on, rather than being assigned to them regardless of their current load. The person or team doing the work "pulls" the next item from a queue when they're ready, instead of having it pushed onto their plate by whoever is planning the work.
The term comes from lean manufacturing. On a factory floor, a pull system means a workstation only produces more of a part once the downstream station signals it needs more, rather than producing continuously and stacking up inventory nobody's ready to use yet. Kanban, the visual board most teams know today, is one implementation of this principle: a WIP limit on a column is the mechanism that stops new work from entering until there's room for it. For the full breakdown of how a Kanban board works, its columns, cards, and WIP limits, see the Kanban entry; this entry focuses on the pull principle itself.
Pull systems apply beyond Kanban boards too. A support queue where agents grab the next ticket when they close one, rather than having tickets assigned by a dispatcher, is a pull system. A developer who takes the next item from a prioritized backlog when they finish their current one is pulling. The visual board is a common tool for it, but the underlying idea, work starts when there's room, not when someone decides to hand it out, is what defines the system.
Pull vs Push: The Core Difference
The distinction is about who decides when a task starts, and what triggers that decision.
| Aspect | Push system | Pull system |
|---|---|---|
| Who starts work | A manager or planner assigns it | The person doing the work takes it on when ready |
| Trigger | A plan or schedule says it's time | Capacity opens up, a WIP limit slot or a finished task |
| Typical failure mode | Overload, work piles up on already-busy people | Idle capacity, if the queue isn't kept full enough |
| Visibility of overload | Hidden until someone falls behind | Visible immediately, a full column can't accept more |
Why Push Systems Overload Teams
In a push system, new work arrives on a schedule, a planning meeting, a sprint kickoff, a manager's Monday assignments, regardless of how much is already on each person's plate. A designer with 3 open tasks and a designer with 8 open tasks both get assigned the next task the same way, because the assignment decision doesn't check current load.
The result is that busy people get busier. Nothing in a push system stops new work from landing on someone already at capacity, so the person with the most unfinished work often ends up with the most new work too, simply because they're the one available when the assignment happens.
How a Pull System Works in Practice
A pull system flips the trigger: work moves forward only when there's room for it. On a Kanban board, this is enforced by a WIP limit, a cap on how many cards can sit in a column at once. When "In Progress" is full, no new card enters it until one moves out, which means nobody can be assigned a fourth active task while three are still unfinished.
This changes the question a team asks before starting something new. In a push system, the question is "is this the next priority?" In a pull system, the question is "do we have room to start this without stalling something already in motion?" Both questions matter, but only the second one prevents overload directly.
Pull Systems Beyond Kanban Boards
The pull principle shows up anywhere work is queued and picked up on demand, not only on visual boards.
- Support queues, where an agent grabs the next ticket after closing the current one, instead of a dispatcher assigning tickets by hand
- Developer backlogs, where an engineer pulls the next prioritized item once their current one ships, rather than a lead handing out assignments each morning
- Editorial queues, where a writer takes the next brief from a ranked list once a draft is submitted
- Client intake, where a new project starts once a team has confirmed capacity, rather than being scheduled the moment a contract is signed
Pull Systems in Melororium
The Tasks module supports configurable WIP limits per column, so a column stops accepting new cards once it's full, the mechanism that turns a board from a to-do list into a working pull system. Cards drag and drop between columns, and the board updates for the whole team in real time, so everyone can see exactly when a slot opens up rather than waiting on a status update from someone else.
In Melororium
See WIP limits and pull-based boards in Melororium
Common mistakes with pull system
What teams get wrong most often, and what to do instead.
- 1
Calling it a pull system while still assigning by name
Running a board with WIP limits but having a manager assign specific tasks to specific people each morning anyway. The board looks like Kanban, but the assignment habit underneath is still a push system.
- 2
No WIP limit, so everyone pulls at once
Letting people pull as many tasks as they want with no cap on a column. Without a limit, pulling becomes indistinguishable from pushing, since nothing stops five tasks from landing on one person's plate.
- 3
Confusing a reordered queue with a pull system
Reprioritizing the backlog constantly based on whoever raised their request most recently, so the "next" item keeps changing before anyone pulls it. A pull system needs a queue stable enough to actually pull from.
- 4
Removing the WIP limit the first time someone looks idle
Raising or dropping a column's cap because a person finished their task and has nothing new yet. A brief idle moment is the system working as designed, it's the signal that capacity exists, not proof the limit is wrong.
Frequently asked questions
What's the difference between a pull system and a Kanban board?
A pull system is the underlying principle: work starts when capacity opens, not when it's assigned. A Kanban board is one common tool for putting that principle into practice, using WIP limits on columns as the mechanism. You can run a pull system without a board, a support queue is one example, and you can run a board without truly pulling if WIP limits aren't enforced.
Is Scrum a pull system or a push system?
Both, depending on the boundary. At sprint planning, the team pulls a set of stories that fit its capacity for the sprint, that part is a pull decision. Once the sprint starts, the committed stories are fixed for that cycle, which behaves more like a push within the sprint itself. Kanban's pull happens continuously; Scrum's pull happens at fixed intervals.
Why does a pull system reduce multitasking?
Because a WIP limit caps how many tasks can be in progress at once, someone can't start a fourth task while three are still open if the column is full. That forces tasks to finish before new ones begin, the direct opposite of taking on more work than capacity allows.
Can a pull system work without a visual board?
Yes. Any queue where the next item is taken on demand rather than assigned on a schedule is a pull system, a support ticket queue or a prioritized backlog both qualify. A board makes the capacity and the queue visible, which helps, but it isn't required for the principle to work.
Does Melororium support pull-based work assignment?
Yes. WIP limits are configurable per column on the Tasks board, so a column stops accepting new cards once it's full, and the whole team sees the board update in real time as capacity opens.
