Directionality

Diagrams may be either vertical or horizontal. Choose which, based on the space you have available.

Vertical

In vertical diagrams, Arrows must point down.

Prefer vertical diagrams if space allows.

Horizontal

In horizontal diagrams, Arrows must point in the direction of writing.

• In left-to-right contexts, such as English, Arrows will point right.
• In right-to-left contexts, such as Arabic, Arrows will point left.