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Swimlane Diagram: what it is and how to create one
Last updated: Mayo 2026
A swimlane diagram (also called a cross-functional flowchart) is a type of flowchart that divides the process into columns or horizontal rows, where each lane represents a responsible actor: a department, a role, an external system, or a customer.
The name "swimlane" comes from the visual analogy with a swimming pool: each participant swims in their own lane, and the diagram shows how tasks move from one lane to another.
Why use a swimlane diagram?
The main advantage over a simple flowchart is visibility of responsibilities and handover points. When a task moves from one department to another, the diagram shows this explicitly as a connection crossing the boundary between lanes.
This is especially valuable for:
- Identifying bottlenecks — flow slowdowns typically occur at handovers between departments.
- Defining responsibilities — it is clear who is responsible for each activity, eliminating grey areas.
- ISO 9001 audit preparation — auditors can verify that each process has assigned owners.
- Employee onboarding — new employees can understand what other departments do and where they intervene.
Examples of use in companies
B2B sales process
Lanes: Prospect / Sales team / Pre-sales / Legal / Customer Success. Shows exactly when the sales rep hands off to pre-sales, when legal comes in for contract signing, and when Customer Success takes over for onboarding.
Procurement process
Lanes: Requesting department / Purchasing / Supplier / Management / Accounting. Shows the approval flow and controls at each level.
Support incident management
Lanes: Customer / Level 1 support / Level 2 support / Engineering. Documents the escalation process and criteria for moving a ticket between levels.
Want to create your first swimlane diagram? Start free in Mapaflow — no credit card, no commitment.
Related resources
Frequently asked questions
- A swimlane diagram, also called a cross-functional flowchart, organises process activities in columns or horizontal rows where each lane represents a department, role or responsible system. It shows at a glance who does what at each point in the process.
- A classic flowchart shows the sequence of activities without indicating who performs them. A swimlane diagram adds the responsibility dimension: each action is placed in the lane of the responsible actor, making handovers between departments visible.
- Yes. In Mapaflow you can create process diagrams and organise nodes visually by department or owner. You can use swimlanes inside the editor to represent cross-functional processes with classic ISO 5807 notation or BPMN 2.0.
- Yes. Swimlane diagrams are especially useful for ISO 9001 because they clearly show each department's responsibilities in the process, making role assignment and traceability easier during audits.
- Use a swimlane diagram when a process involves more than one department, role or system. It is especially useful for processes such as B2B sales (commercial + support + legal), employee onboarding (HR + IT + manager), or order management (customer + sales + logistics + invoicing).