Understanding Waivers of Discrimination Claims in Employee Severance Agreements

The U.S. Equal Employment Opportunity Commission offers valuable information on their website.
The site provides guidance on terminated employees’ rights and obligations when an employer offers severance pay in exchange for a waiver of discrimination claims, including a checklist with tips for employees and a sample of an agreement offered to a group of employees giving them the opportunity to resign in exchange for severance benefits. 

The EEOC provides a useful summary of the requirements for a legally enforceable severance agreement and the potential pitfalls into which an employer may stumble.
http://www.eeoc.gov/policy/docs/qanda_severance-agreements.html