The purpose of this Massachusetts Department of Education document is to create an awareness of, and to provide information about, adult high school credentialing programs based upon assessment of skills, which augment existing ways to earn a high school diploma. It is intended for staffs of adult learning centers, adult education programs, CETA training programs and community based educational organizations. A rationale for developing new programs is provided and the underlying need and philosophy is documented. Certification requirements are identified in terms of basic and special skills and credit for prior learning or experience. Certification requirements for four different models currently being implemented in Massachusetts are described. It explains the steps involved in the assessment process, and outlines assessment techniques. Administrative issues of staff roles, advisory committees, financing, counseling, and admissions policies are also discussed. (Author/AEF)