How do you verify the authenticity of the documents submitted?

We have many specific samples of documents for many countries, and a precise list of criteria in order to verify the document’s authenticity. We also use many reference materials, resources, and professional services to verify the submitted material. If we have any questionable documents, these will be sent to their issuing institution or the Department of Education of the issuing country, for verification. This process can be the most time consuming, sometimes taking 1-6 months.