SIF Data Model Entity Relationship Diagram

I've been developing a high level Entity Relationship Diagram for the SIF Data Model. The main goal is to help people more easily see and understand the relationships among SIF objects. Here is the link to a Google Presentation that contains the diagram for the Student Information Systems (SIS) objects. My long term goal is to make this more interactive, but hopefully it is useful to some people in its current state. Please note two things: 1) this is a small subset of the overall data model (I will be adding more areas soon) and 2) the level of detail in the ERD only reflects objects and their primary and foreign keys. Please see the SIF Implementation Specification for full details.