 From 1995 to 2005, hospital doctors' training was assessed and deemed to be complete by the Specialist Training Authority (STA), which was formed by the combined Royal Colleges.The STA awarded a certificate called a Certificate of Completion of Specialist Training, or CCST.Currently these two certificates are considered equivalent; however, the GMC has the authority to change the requirements for acquisition of a CCT so that in future they would not be regarded as equivalent.