The CELTA Certificate is an ESL teaching certificate issued by Cambridge University that is used to certify one in the UK to teach English to adults. Often British organizations such as International House, the Britsh Council and Shane Language School require that one have a CELTA certificate. TESOL certificates that are offered by private companies are no where close to providing the same kind of teacher training.
The certificate program lasts for 4 weeks at 5 days per week, 6 hours per day. The cost is roughly USD$3000, and it is not uncommon for students to fail or drop-out of the course. Through behaviouristic methods, participants are given some background in language learning theory, hands-on classroom teaching and immediate criticism and self-criticism of one's classroom teaching.
Other topics covered in the course are lesson planning using the Test-Teach-Test and Pre-listening, While-listening, Post-listening plans.