Trinity Diploma in TESOL
(DELTA equivalent)

Gain your advanced qualification in ELT with Europe’s leading course provider – now available fully online

What is the Trinity DipTESOL?

The Diploma in Teaching English to Speakers of Other Languages (DipTESOL) is equivalent to a Cambridge DELTA and is an internationally respected, prestigious qualification for experienced teachers of ESOL/EFL. In contrast to the Cambridge DELTA, the Trinity DipTESOL provides more of a focus on phonology and the option to base your projects on your own particular context.

It is ideal if you are looking for the step in your ELT career and you are ready to gain an advanced qualification in ELT which will impress employers worldwide. The Trinity DipTESOL will transform your teaching and help you move into roles such as examiner, course book writer, teacher trainer or school manager. 

Since 1998, we have trained over 600 teachers on this course and become Europe’s leading course provider. Gain your Trinity DipTESOL qualification with us and we can help you advance your career in ELT too.

DipTESOL Course Overview

  • Blended or Fully Online: Choose between studying 7 months online followed by 4 weeks face-to-face (in Barcelona, Cádiz, Hong Kong or Kerala) or studying fully online.
  • Practical: Emphasis throughout the course on developing teaching skills and applying insights to your classroom.
  • Phonology: Emphasis on teaching pronunciation unique to the Trinity course and highly valued by our graduates.
  • Flexible: Work at times to suit your weekly schedule and take up to 3 years to complete the course if necessary.
  • Professional: Learn from world-class full-time and guest tutors, including Lindsay Clandfield, Scott Thornbury and Adrian Underhill.
  • Supportive: Receive unlimited support via email and Zoom from our Course Director.
  • Transformational: Develop your teaching skills and improve your chances of finding some of the best positions in ELT via our careers service.
  • Recognised: Gain a prestigious, internationally recognised and advanced qualification in ELT.

The Trinity Diploma in TESOL Course

The Trinity Diploma in TESOL is for English Language teachers (including primary and secondary school teachers) who:

  • have at least two years of full-time experience or equivalent (960 hours).
  • work in the private or public sector with language schools, universities or teaching privately.
  • are looking for an advanced professional qualification in English Language Teaching.

Wherever you are in the world, you can gain this qualification. From 2021 we are offering even more flexibility with the format. Choose from two ways to take this course:

Option 1 (Blended): 7 months part-time online + 4 weeks intensive face-to-face training including teaching practice in Barcelona, Cádiz, Kerala or Hong Kong.

Assessment: Unit 1 (in a registered centre), Unit 2 (Online), Unit 3 and 4 (in Barcelona, Cádiz, Kerala or Hong Kong). In the case of restrictions due to COVID-19, you will be able to switch to Option 2 (below) to do units 3 and 4 online.

Option 2 (Fully Online): 7 months part-time online + 4 weeks intensive online training including your teaching practice.

Assessment: Unit 1 (in a registered centre), Units 2, 3 and 4 (Online).


You must have at least two years of full-time teaching experience or equivalent (960 hours) teaching English as a Foreign or Second Language. The experience can be with any age group or teaching context. If you do not meet this requirement, we recommend our CELTA course.

In addition to the experience requirement, we ask that applicants have a C2 level of English before enrolling in the course.

You do not need a certification to prove your English level.

However, we do accept the following as proof of language ability (if they are less than two years old):

  • – Cambridge C1 Advanced: Grade A and no less than 200 in any paper
  • – Cambridge C2 Proficiency: Grade A, B or C and no less than 200 in any paper
  • – Cambridge IELTS: Overall band score 8.5 and no less than 8.0 in any skill
  • – TOEFL iBT: Overall score 115 and no less than 27 in any skill

If you do not possess one of the above certifications, then your English level will be assessed throughout the application process.

The 7-month part-time online phase:

  • Seven months online training in our virtual classroom with a group of up to 16 fellow teachers and our team of tutors, participating in forums, webinars, live video classes and email exchanges with fellow students and tutors.
  • Twenty, week-long modules (with some rest weeks in between) led by one of our tutor team which you are expected to contribute to regularly, but the interaction is not scheduled (other than a 45-minute live video class), so you can log into the course throughout the week to suit your own working day.
  • Weekly assignments helping you comprehensively prepare for exams and receive written feedback from your tutor so that you can visualise your development and performance against Trinity’s benchmark. 
  • In total, you will complete around 350 hours of online study and support during this phase (50 hours per month).
  • Start in October, January or April


What can I expect to learn during the 7 month part-time phase?

Our goal is to provide a course which is dynamic and practical and meets the needs of the participants, so your work in our virtual classroom will be backed up with tasks which get you to apply ideas in your own teaching situation. With a team of highly experienced and qualified tutors, the online modules will help you to deepen your theoretical knowledge and practical skills while preparing for the four assessed units of the Trinity Dip.TESOL course:

  • Unit 1: Teacher Development and Language Awareness
  • Unit 2: Research projects
  • Unit 3: Phonology
  • Unit 4: Teaching practice

The 4-week intensive phase:

  • 4-week intensive teaching practice phase including lesson planning, teaching practice and feedback from our expert team of tutors.
  • Choose to complete this phase face-to-face in one of our centres or fully online.
  • You will have four internally assessed lessons and one externally with a Trinity examiner. You will also have an opportunity to teach unassessed to get to know the students and get feedback and advice from tutors.
  • External assessment of phonology and teaching practice with Trinity examiner.
  • Including lesson planning time, you will study for around 40–50 hours per week during the four weeks.


What can I expect during the intensive phase?

If you choose our blended study option, you will complete your unit 3 phonology interview and unit 4 teaching practice assessment during a four-week phase in Barcelona, Cádiz, Kerala or Hong Kong. You will deliver your classes to adult students in one of our centres and receive support from our tutors who will be with you in the school.

If you choose our online study option, you will complete your unit 3 phonology interview and unit 4 teaching practice assessment online. You will deliver your classes to adult students using Zoom and receive support from our tutors online. We can provide the students for you, or you can use your own students.

In both cases, there are various options for dates.

Once you have completed the course and passed the assessments, you will be awarded the Trinity Diploma in TESOL. This is an internationally recognised professional qualification for English Language Teaching. Many UK universities are now offering credits and/or exemptions on their MA and other courses for those who have obtained their Trinity Diploma in TESOL.

This qualification opens doors to other areas of the ELT profession. Our graduates have gone on to become:

  • Teacher Trainers
  • Coursebook Writers
  • Directors of Studies
  • Managers at major ELT publishers
  • School Managers and Owners
How will I be assessed?

Unit 1

You will complete a written exam consisting of a grammar section and two sections with essay questions about teaching and learning. This can be taken in an Oxford TEFL centre or at any Trinity authorised centre (there are currently 45 around the world). If you have chosen to take this course fully online, this will be the only assessment for which you will need to attend a centre. Exams are offered in May, August or November.


Unit 2

A coursework portfolio including three action research projects. The projects involve observation of other trained teachers, reflection on your own teaching and a research project, where you collect data. Work on the portfolio will be completed throughout the course, guided by a tutor with expertise in your chosen areas. You will need to base the reflection task on teaching a group or groups of at least 6 students for 15 hours in total. These projects are submitted online.


Unit 3

In this 30-minute interview with a Trinity examiner, you will deliver a short presentation on a pronunciation activity you have designed and delivered, transcribe a short utterance into phonemic script and have a discussion of the theory and practice of phonology.  This unit is usually taken alongside the final externally assessed lesson. This is completed during the four-week intensive face-to-face or online phase.

Unit 4

Assessment of your teaching of five one-hour lessons, each preceded by a discussion of your lesson plan (10 minutes) and followed by a discussion of the lesson with the examiner (20 minutes). Four lessons are assessed by Oxford TEFL tutors, the fifth by a Trinity examiner. For this part of the exam, you will be teaching students in one of our centres. This is completed during the four-week intensive face-to-face or online phase.

The Tutors

Our team of trainers are experts in their field and qualified to a minimum of DELTA / DipTESOL level, which means they are qualified to train teachers of English. They offer support every step of the way throughout your course and are active contributors to the TEFL industry. 

Course Start Dates

Below you can find the available start dates for the 7-month part-time phase.

April 19th 2021
Blended or Fully Online
October 11th 2021
Blended or Fully Online

Course Fees

Trinity DipTESOL (Standard Option)
€450 deposit to reserve your place + €2150 before the course starts.


Trinity DipTESOL (Instalments Option)
€450 deposit to reserve your place + 3 instalments of €750.
Course Starts19th April 202111th October 2021
Deposit Paid (€450) by12th April4th October
1st Instalment (€750) by19th May11th November
2nd Instalment (€750) by19th July11th January
3rd Instalment (€750) by19th September11th March


Your course fees include:

*Please note: Aside from the course fees, the following will also have to be paid in order to complete the course:

  • Trinity Examination Fees — In 2021 the fees to submit all 4 units of the Trinity DipTESOL in order to complete the course are a total of €534These fees are to be paid at least two months before your first submission. Full Fee Details
  • Required Books — There are 6 books you’ll be required to have in order to complete the course. Diploma Reading List
Some of those who take our Trinity DipTESOL courses are partially/fully financed by their schools, usually in return for a commitment to stay on with them after graduation. You may wish to ask your employer about any funding for development available.

Assessment Dates

Once you have completed the 7-month part-time phase, you will be eligible to take the Trinity assessments.
The assessments can be completed in any order.

Unit 1 : The Written Exam

In 2021, in the case of both Option 1 and Option 2, this assessment must be completed in-person. This can be taken at any centre which is authorised to run the Trinity DipTESOL, CertTESOL, or TYLEC courses (check herehere, and here).

We will contact you 10 weeks before each exam date to ask if/where you would like to take the exam.


Examination DatesOxford TEFL Registration Deadline
Friday, 21st May 2021
Friday, 2nd April 2021
Friday, 13th August 2021
Friday, 2nd July 2021
Friday, 26th November 2021
Friday, 8th October 2021
Unit 2: The Research Projects

You will electronically submit all three projects. There is no set date for submission, but you will need to work with your assigned tutor to complete the projects before support expires. You can request extra support after the deadline for a fee of €200 by emailing David Young, your Course Director.

Unit 3 and 4: The 4-Week Intensive Phase

During the 4-week intensive phase of the course, you will complete the phonology interview (Unit 3) and the observed lessons (Unit 4).

You will be contacted in February so you can tell us your preferred location/dates.


5th July – 30th July 2021

2nd August – 27th August 2021

30th August – 23rd September 2021

Kerala25th October – 19th November 2021
Cádiz2nd August – 27th August 2021
Hong Kong2nd August – 27th August 2021

5th July – 30th July 2021

2nd August – 27th August 2021

3rd January – 28th January 2022

Terms and Conditions (Trinity)
Entries received between eight and four weeks before the exam date will be subject to a Trinity surcharge of 50%. Entries received fewer than four weeks (28 days) before the examination will not be accepted.
Terms and Conditions (Oxford TEFL)
If a candidate fails to complete a minimum of 80% of the course work, Oxford TEFL reserves the right to refuse entry for assessment. This will be discussed individually with the candidate prior to the entry dates.

Careers Support

  • We are committed to providing our graduates with the best lifelong careers support possible. We work with you before, during, and after the course to help you secure a new job if that is your aim.
  • Since 1998, we have helped hundreds of our graduates find work all over the world. We have an Oxford TEFL Jobs Facebook page which is updated regularly with jobs around the world.
  • You can also stay in touch with our community of teachers, trainers and graduates by joining our Trinity DipTESOL Facebook group (exclusively for our teachers, graduates and trainers).

What do graduates say?

Still have questions?

Meet Rubens, one of our expert tutors, as he answers some of the most common questions about the DipTESOL. Find out why this course is a great step in your career.