I have read some of the introductory links posted by Christopher, and I have an easy ( i think) question.

When a company decides they want to purchase SAP EHS Management, what other modules are a pre-requisite, or a given, in order to use it?

For example, if a company wants EHS Management, would MM and SD be a part of their purchase or a prerequisite?

Use of SAP EHS Management

SAP EHS Management is integrated very well in the SAP ERP processes. Normally it is not used as a "standalone" application/module. It support companies to be compliant regarding chemical products. The main integration points are:

1. SAP MM
2. SAP DMS
3. SAP SD
4. SAP PP
5. SAP QM
6. SAP PM