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Software Design Center
HOW TO DRAW SSADM DIAGRAMS (cont'd)
Effect Correspondence Model
Effect Correspondence Diagrams (ECD) illustrate all the entities affected by a given event.
An Effect Correspondence Diagram
Effect Correspondence Diagram (ECD) Notations
Entity
Use a rounded rectangle to represent an entity.
Learn how to add and edit text on an entity.
Simultaneous Effects
When an effect forces the entity to take on multiple roles, encapsulate these roles inside a rectangle.
Optional Effects
Mark entities with a small "o" to identify an effect that forces the entity to behave in one or more mutually exclusive ways.
Optional Effects
Use an asterisk (*), to illustrate an entity that is affected multiple times.
One-to-one Correspondence
If two entities are updated at the same time, link them with a double-headed arrow.
Enquiry Access Paths (EAPs)
Enquiry Access Paths (EAP) define a route through the Logical Data Model to satisfy a particular enquiry. Remove the crow's foot relationships and relationship labels and replace them with EAP arrows.
An Enquire Access Path Diagram
To draw an EAP in SmartDraw, use a simplified LDM with arrows indicating the direction of the enquiry.
