Business Administration Scale (BAS) ​Assessor ​Certification ​is ​valid ​for ​two ​years ​and ​may ​be ​renewed ​through ​a ​recertification ​process. ​Recertification ​is ​also ​valid ​for ​a ​two ​year ​period ​and ​can ​be ​renewed ​once. This ​registration ​is ​for ​your ​FIRST ​recertification ​(2 ​years ​after ​your ​initial ​certification). ​ ​