Reviewer posted - “ASA only provides single network based access control list features”. Maybe not in the license you purchased. http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/contexts.html#wp1036557
Common Uses for Security Contexts
You might want to use multiple security contexts in the following situations:
•You are a service provider and want to sell security services to many customers. By enabling multiple security contexts on the security appliance, you can implement a cost-effective, space-saving solution that keeps all customer traffic separate and secure, and also eases configuration.
•You are a large enterprise or a college campus and want to keep departments completely separate.
•You are an enterprise that wants to provide distinct security policies