The present invention extends to methods, systems, and computer program products for structured arrangement of visual endpoints in diagrams. Generally, endpoint arrangements are consistently used on shapes in a domain (diagram type) based on common information flow characteristics of the domain. In addition, shape specific positioning of endpoints can be based on a shape's unique characteristics. Diagrams are more readable across an organization because diagrams have a more consistent flow structure in the form of endpoints and connections. Diagrams are also easier to construct because endpoints have predictable locations.