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Trinity DipTESOL


The Trinity Diploma in TESOL is a qualification for experienced teachers of English to Speakers of Other Languages. It is accredited at Level 7 on the Office of Qualifications and Examinations Regulations (Ofqual) Regulated Qualifications Framework, the same level as master’s degrees, and is a respected qualification in the UK and around the world.

Next Date

18 Sep 20239 months (tuition)

Why you should choose our DipTesol course

About you: If you’re already an experienced teacher of English to Speakers of Other Languages and want to take the next step, then the Trinity Diploma in TESOL is the right course for you. At the end of your course, you’ll understand the theories underpinning teaching practice and how you can apply these in the classroom. This qualification is ideal if you want to progress to a more senior position in education.

The online DipTESOL will help you advance your knowledge and progress in your teaching career. It is accredited at Level 7 on the Office of Qualifications and Examinations Regulations (Ofqual) Regulated Qualifications Framework, which is the same level as a Master’s degree. It’s also a respected qualification in the UK and around the world.

How it works
Gain a Masters Level qualification in 12 months
Level 7 qualification on the National Qualifications Framework
Flexibility to study in your own time and take classes in the evenings and on the weekend
Delivered fully online so you can study your course from anywhere in the world
Accredited by Trinity College London
Student Satisfaction

Course Structure & Dates

Course Details

This 12-month course includes 9 months of online tuition (Units 1&2) with observation and assessment elements conducted online in virtual classrooms through our innovative learning platform. Your practical assessment components (Units 3&4) will be conducted in months 10-12 of your course.

The Trinity Dip TESOL course is a very demanding, but rewarding experience. When you study this course, you’ll develop:

  • An in-depth understanding of the grammatical and phonological systems of English.
  • An ability to identify the needs and motivation of learners from a variety of backgrounds.
  • A knowledge of the main theories of teaching and learning and how they relate to ELT.
  • An awareness of the role of English in the world.
  • A heightened awareness of how to reflect on your own teaching.
  • A greatly increased repertoire of techniques that you can use in the classroom.
  • An ability to select and exploit materials according to learners’ needs.
  • A greater appreciation of how to approach the teaching of the four skills.
  • An awareness of how to support your colleagues, including new teachers, in the work environment.
  • Knowledge of areas key to the teaching and classroom management of younger learners.

The Trinity DipTESOL is a qualification listed at Level 7 on the Ofqual Register of Regulated Qualifications in the UK and can carry credits for Level 7 MA degrees in the UK.

We realise that trainees have different schedules and there are times when you can expect to be busier at your place of work than others. However, generally, you will need to allocate approximately 8 hours for reading/writing per week.

Through the use of the forums and chatrooms on the online Moodle platform you will be regularly interacting with fellow trainees over the nine months – the collaborative nature of the tasks also contributes to feeling included. In addition, there are regular individual tutorials held with the course leaders.

Oxford International teacher trainers take great care to provide a personal service so that you won’t feel isolated during the course. The Course Director or one of the Senior Tutors will act as your principal contact and help you with any queries or problems you might have. Additionally, the interactive nature of the Moodle system ensures that throughout the course, you will be exchanging views and collaborating with fellow course members.

Course Content

Language, Teaching and Learning
(Distance learning component)

This Unit is completed in a virtual learning environment via Moodle. Over 9 months you will need to complete a series of fortnightly workbooks, researching from key texts and websites while closely liaising with fellow course members.

Unit 1 is assessed by a written exam, which is usually taken in months 10 – 12 of the course.

Over 9 months you will work on a series of 18 workbooks that will provide you with the knowledge and skills required to succeed in the unit assessment. Each workbook:

  • looks at a syllabus area related to teaching, learning and professional development. You are required to post responses, share ideas and research, and engage in interactive learning with fellow course members
  • complete research and coursework activities relevant to an area of grammar or phonology
  • answer several essay questions

Each workbook is expected to take 25 hours to complete, with additional independent research on the topic area.

Coursework portfolio

This unit will generally be completed at your place of work and runs parallel to or immediately after Unit 1. The portfolio consists of two written assignments based on a series of tasks in which you are asked to observe fellow teachers, and teach a set of lessons yourself. You are also required to reflect upon aspects of the teaching and learning that take place.

Over the 9 month period that you are working on the learning and teaching components that make up Unit 1, you will also be carrying out development and research tasks at your place of work (Unit 2).

  • You will conduct in-class observation of your fellow teachers. You will need to create a method by which you can focus on a specific area of teaching of interest to you and will subsequently adapt the aims of your observation as you reflect on the outcomes and record these in a coursework journal.
  • Maintain and update your coursework journal as you reflect on the aspects of how your teaching has developed over an extended period.
  • Identify and research an area of TEFL/TESOL on which you will write an extended essay piece. Our training team will help you to select appropriate topics and give advice on how they might best be developed.

To complete this unit of the course you will need to be teaching on a regular basis alongside experienced fellow teachers.

Phonology in the classroom

You can complete Unit 3 either in person at our London Greenwich school, while you are completing your Teaching Practice (Unit 4), or entirely online via our virtual classroom. In both contexts, you will have a series of input sessions on this topic followed by a 30 minute formally assessed interview with a moderator from Trinity College London in which you discuss issues relating to the theory and practice of phonology.

Teaching Practice

The Teaching Practice component is normally carried out within two weeks online via the virtual classroom or on-site at our London Greenwich school.

You will be allocated a class and will teach a set of five assessed lessons: four of these will be assessed by members of the Oxford International Teacher Training team, with the fifth being externally assessed by a moderator from Trinity College London. You will also discuss your own reactions to the experience with the moderator.

This section of the course will draw upon the learning that has taken place during the earlier course components and allow you to demonstrate your professional knowledge and expertise.


After completion of the distance learning sections (Units 1&2), you will need to commit to an approximately two-week intensive component online. During this time you will be preparing for the external moderation that assesses Units 3 and 4. This will involve you planning lessons, teaching classes and attending phonology input sessions. Most participants typically complete their Unit 1 examination (see above) during this time as well.

This section of the course will draw upon the learning that has taken place during the earlier course components and allow you to demonstrate your professional knowledge and expertise. As with the other course components, you can expect to receive a highly personalised level of support to enable you to complete the course successfully.

Although this course component is mainly about Units 3 and 4, participants will typically do the written examination, to complete Unit 1, at the same time.

Unit 1

There are 3 opportunities to sit the exam each year – May, August or November. Most participants will sit the exam in month 12 of the course (which is May or August of the following year, depending on whether you are in the June intake or September intake) at the same time as the on-site/online component. You can arrange to defer your Unit 1 exam to a later opportunity, but additional guidance is not given after the Distance Learning component has been completed. Should extra tutorials be needed, these can be arranged with the Course Director for £100 an hour.

Unit 2

The Unit 2 Coursework portfolio is submitted in March (for June intake participants) and June (for September intake participants) only. An extension can be arranged but further support after this time will not be provided. Additional tutorials can be arranged with the Course Director for £100 an hour.

Unit 3

Unit 3 can be completed either at our Greenwich school while you are completing your Teaching Practice, or online. In both contexts, you will have a series of input sessions on this topic followed by a thirty-minute formally assessed interview with a Trinity moderator in which you discuss issues relating to the theory and practice of phonology.

Unit 4

You will be allocated a class and you will be observed and assessed on four occasions by course tutors and finally by the Trinity moderator. You will also be expected to submit a lesson plan, a class profile and a post-lesson evaluation for each lesson you teach.

Upon enrolment, you will be issued with personal log-in details that will allow you to access the Oxford International Teacher Training Diploma course.


£1710 in a single payment or
£1900 in 4 instalments

Instalment payment option = £100 nonrefundable deposit, then 3 payments of £600 (2 weeks before course, then before progress tutorials at the start of months 2 and 4). The prices above cover online training course and tutorage only. You will also need to buy certain key texts (recommended), and pay Trinity College assessments fee of £417.

The full amount is payable as soon as you have completed the online course (Distance Learning Component) and are ready to be formally assessed on any Unit. We require a minimum of 2 months’ notice. The assessments fee is broken down as follows:

  • Unit 1 (Written Exam) £46
  • Unit 2 (Coursework portfolio) £70*
  • Unit 3 (Phonology assessment) £102
  • Unit 4 (Observed Teaching Practice) £199
    All are determined by Trinity, and subject to change.

Start Date


End Date



9 Months (tuition)
9 months (tuition)

Trinity College London is an independent awarding body and examinations board and has been providing assessments and qualifications around the world since 1877. As part of Oxford International, we work with them to ensure that students receive high-quality and accredited teacher training.

Why OI Digital Institute?

We provide students with high-quality online education courses. We pride ourselves on offering flexible study options tailored to your needs and recognised by leading Higher Education institutions and professional bodies.

How we're different

Our mission is to create access to education and provide more opportunities for students to achieve their higher education goals worldwide. We believe that online learning can and should be more than reading pages of text and watching videos of a person who you’ve never met and probably never will. Real people, real teachers and genuine contact can make a good experience great. And we should know, as part of Oxford International, we’ve been helping international students achieve exceptional results for 30 years.

What our students say?

We create our courses with students in mind. We look at helping you to achieve results while also enjoying the experience of learning. As such, we regularly receive great feedback from our students, and we use this to find ways to always do more for you while you’re studying with us. Hear more about what our students have to say…

Entry requirements

To successfully apply and participate you must be at least 18 years old, have at least two years of teaching experience (or equivalent) and are looking to gain the professional expertise and knowledge required for more senior positions in the EFL/ESOL industry.

A copy of your most significant academic certificate/degree. This is a Trinity College stipulation that proof of qualifications are rigorously checked.
Trinity Cert TESOL or Cambridge CELTA is desirable but not essential.
A minimum English language proficiency of CEFR level C1 or above

Meet the team

Passionate, creative and caring, our team are dedicated to helping you learn without limits.

Students and professionals use OI Digital Institute

The level of teaching, experience and patience from the course providers was absolutely incredible. It was intense, there was a lot to learn in a short space of time, but it was structured to ensure it was taught and consumed at an attainable pace. It was extremely rewarding.
Dan Parkinson
I enjoy studying with my classmates, because we make progress together, give feedback together, and have made good memories. The teachers are also very good, they take good care of our study and life, and give us good guidance.
Zheng Langxing
My experience in the OPSE course was amazing. Also, I am grateful to the teacher for her efforts and how she made my journey unbelievable. I improved in many aspects and I learnt many things. Moreover, I feel so satisfied and happy about how the school helped me to achieve my goals
Said Almamari
I now feel confident and capable to teach not only in person but in online spaces thanks to their guidance. I highly recommend the Trinity CertTESOL through the OI Digital Institute!
Leane Meiring
This course helped to systematise my knowledge of English grammar and phonology as well as gave me some important tips on the teaching methods and techniques. The most valuable tip was how to maintain the balance between student talking time and teacher talking time. Might sound easy, but it's not!
The tutors support was excellent, both Jane and Lenka put a lot of effort and created the most welcoming atmosphere with very interesting input sessions, provided detailed guidance and support with the lesson planning, demonstrated delivery of high-quality lessons & gave very personalised feedback.
Alyona Jasper
The tutors were very supportive and encouraging at all times throughout the course, which really helped me get through this super-intensive 4 weeks. Thank you so much, Lenka, Jane and Amanda! The qualification has given me more options and confidence in looking for TEFL jobs around the globe.

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Frequently asked questions

The Oxford International Teacher Training team is a team of dedicated education professionals passionate about languages and teaching. Our trainers are highly qualified experts in their field and have a wealth of experience teaching in a face-to-face setting as well as online. They are here to guide you and help you every step of the way.

Oxford International is accredited by Trinity College London to deliver the Diploma in TESOL.

No, but you will need to have a location where you will be able to deliver a series of lessons for research and development issues. You will also need to be able to observe a set of lessons by experienced teachers. In certain circumstances, these course components can be carried out at the centre in Greenwich.

No, unlike the DELTA, on the Trinity Diploma course we will provide all observation tutors during the 2-week on-site component.

You can re-sit any of the four Units of the course. Resit fees are the same as initial assessment fees. If you fail the Internal Lessons on Unit 4 – Teaching Practice, you will need to pay £100 for each Internal lesson you need to be observed/commented on, and a further £44 to submit your lesson plans and materials to Trinity College London for reassessment.

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