Accreditations are valid for five years. (ANAB started the process of transitioning from a four-year cycle to a five-year cycle in 2016.) Continuance of accreditation (surveillance) includes an annual office assessment and an annual witnessed audit. a complete reassessment is required every four years. Increased surveillance may required performed if the CB wishes to extend the scope of accreditation to cover additional industry sectors or to participate in certain specialty fields.