Here's a quick 2 minute video that helps to explain Business Processes and why they are important to an organization:
Most people know about ER/Studio Data Architect but few people know about Data Architect's little sister - "ER/Studio Business Architect". Business Architect is currently available as a standalone product as well as part of the ER/Studio Enterprise Team Edition collection of tools.
Business Architect includes modeling tools for Conceptual Models and Business Process Models.
Conceptual Models are a great tool to explain complex data at a very high level to business users. Currently you can convert Conceptual models to Logical models (and vice versa) between Business Architect and Data Architect.
Business Process Models can be used to help explain what is happening within a business via its processes and how those processes interact with each other as well as how they interact with the business data.