Arrange diagrams horizontally

Although BPMN spec allows both horizontal and vertical orientation the horizontal style should be preferred.

Most business people view the process diagrams horizontally while IT people generally prefer vertical orientation - this is a common example of “business - IT divide”. It's IT who should make a step forward because business, not IT, owns the process.

Many BPMN modelers (e.g. Bizagi Modeler, bpmn.io) don't support vertical arrangement.

• Time should flow left to right
• Main process flow in a properly organized diagram tends to be V-shaped
• Attach a sequence flow to any side of the activity box

— Anatoly Belaychuk 2023-09-13 12:41