This Salesforce ER Diagram Events Data Model includes Tasks, Events, and other Platform activity objects. This section's Salesforce ER Diagram Tasks Events Data Model depicts important object relationships. Salesforce ERDs employ Crow's foot notation. Each ERD includes links to topics that describe the fields in the diagram's objects. The data model for your custom objects is determined by what you create. Salesforce ERDs use an Information Engineering (IE) notation variant. The Information Engineering notation was invented by Clive Finkelstein in Australia and CACI in the UK and was later adapted by James Martin.