According to CEC, the initial standards define what beginning teachers must know and be able to do to begin their teaching career.   The initial specialty sets define the knowledge and skills professionals must have to begin their work in specific areas within special education.
Those teachers who are in their careers and wish to deepen their understanding of skills and knowledge will be involved in programs that follow the advanced set of standards.  The larger CEC organization has a set of advanced standards that those programs would need to follow for purposes of advanced accreditation.   Currently our division does not have a specialty set of advanced specialty standards.
DVIDB supports both the initial CEC standards and the advanced set of standards.