Alongside their teaching, the student has to compile dossiers of evidence to record lesson plans, observations and other experiences. These must prove they have reached each of the Training and Development Agency for Schools' 33 Standards required to achieve Qualified Teacher Status. The quantity and quality of evidence considered necessary to fulfil each Standard varies between DRBs, since the DRB has to interpret the TDA's requirements. In England only, the student must also complete the QTS Skills Tests to fulfil Standard 16. This is not required in Wales.