The IASIOS accreditation path is a multi-stage process, with three distinctive phases. Upon formal registration, an applicant facility will receive the status of IASIOS Enrolled Centre while it prepares for accreditation. If its application has been assessed positively, the facility will receive the IASIOS Accredited Centre status. Lastly, a facility may achieve the prestigious status of IASIOS Centre of Excellence if it can prove compliance with the extended requirements outlined in the application documents. The IASIOS fee structure allows for membership-based participation, whereby applicant facilities can remain enrolled into the system for as long as necessary while working towards accreditation.
You can read the step-by-step overview for more information.