 TEFL Tezal Course Guide Accreditation and Affiliations Online courses. The ITTT Online TEFL Tezal courses are fully accredited by the Online Tezal and TEFL Standards Agency. OTSA is a professional educational organization dedicated to raising teacher training industry standards, specifically online courses in the teaching of English as a foreign language. In class courses, TEFL International in class courses are externally validated and moderated by a board of academic advisors. This board includes several internationally recognized experts in the field of English language teaching as well as dozens of regional language experts in language teaching and teacher training. Both international and regional members advise TEFL International staff on our teacher training centers worldwide. International board members visit our training centers worldwide. Members also participate as keynote speakers at free national teacher training conferences and workshops sponsored and hosted by TEFL International. They also provide us with advice on the quality of our training programs in the region they visit and advise us how our programs can adapt and change with growing trends in teacher training. International board members are not TEFL International moderators but industry experts that advise our centers and participate in teacher training initiatives. IATEFL. ITTT is an institutional member of IATEFL, the International Association of Teachers of English as a Foreign Language. www.iatfl.org for more details of this organization. UK College of Teachers.