More State Departments of Education are requiring an outside party to perform an objective, 'third party review' of content being considered for approval. The main purpose is to verify the correlations to a state's standards that a publisher asserts are justifiable correlations. As part of this review, the state also requires the third party reviewer to provide a correlation percentage of the publisher's content to their state standards. The threshold for approval is usually 90% correlated alignment. Examples of states requiring third party reviews are Virginia and Indiana.