LDC Achieves Accreditation Status! LDC has a proud history since 1999 of being the first and only North Central Association (NCA)/AdvancEd accredited education clinic in the United States. More than 2800 schools in Michigan and 18 other states in the U.S. are NCA accredited. AdvanceEd is the authority for an additional 11 states in the South. Accreditation must be reviewed every five years. It takes about a year of hard work to prepare. Preparation requires written reports an