National External Diploma Program
Sometimes this is referred to as EDP. See the NEDP Frequently Asked Questions page from RI Department of Education for Rhode Island specifics.
From the CASAS website:
The National External Diploma Program (NEDP) is an applied performance assessment system that assesses the high school level skills of adults and out-of-school youth. The NEDP evaluates the reading, writing, math and workforce readiness skills of participants in life and work contexts.