OET Writing Lessons · Lesson 1
How to Write a Strong Purpose Introduction
Open your OET letter so the reader instantly understands why you are writing. This short lesson covers Criterion 1 — Purpose — and the simple introduction formula that protects your score from line one.
Lesson 1 of the OET Writing series · ~3 minutes · full transcript below
In short
- Your purpose must be clear from line one — the reader should know why you are writing before reading anything else.
- Use a purpose phrase ("I am writing to refer / request / update") plus the patient's name, age, profession and main health issue.
- Purpose is Criterion 1 of six, scored 0–3; a vague opening loses these marks before the body even begins.
Step 1 — Write with a clear reason
You are writing this letter for a reason, so before you write a single word, answer two quick questions:
- Why am I writing to this particular reader and not someone else?
- What do I want this reader to do?
These are the key aspects of Purpose, and they should be immediately identifiable. Think of your opening like a headline: the reader should instantly understand why you are writing. You expand on the details later — but the purpose must be clear from line one.
Step 2 — Follow the introduction formula
A strong introduction follows a simple formula:
Purpose phrase + patient details
Begin with a purpose phrase such as "I am writing to refer…", then include the patient's name, age, profession, and their diagnosis or main health issue. This tells the reader exactly why you are writing, right from the start.
Step 3 — Study the worked examples
Each example below states the purpose clearly — whether it is a referral, a work assessment or an update — in a respectful, professional tone that tells the reader what action is expected.
| Purpose phrase | Patient & key details | Action expected | Letter type |
|---|---|---|---|
| “I am writing to refer Mr James…” | Being discharged today after a knee joint replacement | Take over physiotherapy in your care | Referral / discharge |
| “I am writing to request your assessment of Mr Lewis…” | 39-year-old warehouse operative, recovering from a back injury, wishes to return to work | Assess fitness to return to work | Assessment request |
| “I am writing to update you on Miss Clara…” | Whom you referred to us with suspected pneumonia | Continue follow-up care and management | Update |
Quick check — which opening shows a clear purpose?
"I am writing regarding a patient in our hospital."
No name, no role, no reason — the reader still does not know why you are writing.
"I am writing to refer Mr Smith, a 45-year-old teacher who has recently been diagnosed with diabetes."
All key details and a clear reason for writing — this is the standard to aim for.
Common mistakes to avoid
- Vague or incomplete openings that name no patient and no reason.
- Leaving out the patient's name and role.
- A purpose that is too general — make it specific to the action you want.
A strong introduction builds clarity and sets the right tone for the rest of your letter. Recap: start with a clear purpose phrase, include the key patient details, and be purposeful — a well-written introduction helps your reader instantly understand your letter's goal.
Want to see whether your own introduction reads clearly? Paste your opening into the free OET Writing Checker, browse clear vs unclear purpose examples, or read the full Purpose criterion guide.
Full lesson transcript
Have you ever opened your OET writing task and thought, "Where do I even start?" Don't worry — you're not alone. In this short lesson, we'll learn a simple way to write an effective introduction so your reader instantly understands why you're writing. Let's jump into Criterion 1: Purpose.
Writing with a clear reason: you're writing this letter for a reason, so what is it? Ask yourself two quick questions. Why am I writing to this particular reader and not someone else? And what do I want this reader to do? These are the key aspects of Purpose — they should be immediately identifiable. Your letter should give a quick, clear sense of what's being asked of the reader right at the very start. Later in your letter you expand on the details, but your purpose must be clear from line one. Think of it like a headline: the reader should instantly understand why you're writing before reading anything else.
A strong introduction follows a simple formula. Begin with a purpose phrase like "I am writing to refer". Then include the patient's name, age, profession, and their diagnosis or main health issue. This helps the reader know exactly why you're writing right from the start.
Let's look at some examples. "I am writing to refer Mr James, who is being discharged today from our hospital into your care for physiotherapy after a knee joint replacement." Next: "I am writing to request your assessment of Mr Lewis, a 39-year-old warehouse operative who wishes to return to work following a back injury." And lastly: "I am writing to update you on Miss Clara, whom you referred to us with suspected pneumonia. Your follow-up care and management would be valued." Each sentence clearly states the purpose, whether it's a referral, a work assessment, or an update. Notice the respectful, professional tone, and how each one tells the reader what action is expected.
Here's a quick check. Which of these introductions shows a clear purpose, A or B? A: "I am writing regarding a patient in our hospital." And B: "I am writing to refer Mr Smith, a 45-year-old teacher who has recently been diagnosed with diabetes." If you chose B, you're absolutely right. It gives the reader all key details and a clear reason for writing.
Common mistakes: avoid vague or incomplete introductions. Always include the patient's name and role, and make your purpose specific. A strong introduction builds clarity and sets the right tone for the rest of your letter.
Let's recap. Start with a clear purpose phrase. Include key patient details and be purposeful. A well-written introduction helps your reader instantly understand your letter's goal. In our next video, we'll explore how to choose the right content to include so every detail you write truly matters.
Next · Lesson 2
Choosing the right content to include
How to select only the case-note information that matters to this reader — Criterion 2, Content.
Frequently Asked Questions
How do you start an OET letter?
What should the first line of an OET letter include?
How long should the OET introduction be?
Is 'Purpose' the same as the first OET writing criterion?
Related OET Writing guides
Continue your preparation with these related resources.
OET Scoring Criteria →
How the 6 criteria are assessed and where most candidates lose marks.
Grade B Sample Letters →
20 worked sample letters by profession × scenario with line-by-line annotations.
Mistake Clinics by Profession →
10 profession-specific mistake clinics — wrong vs right examples per criterion.
Grade A vs B vs C Compared →
Three letters from the same case notes at three bands — what moves you up one.
OET Writing Correction
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Dr Mariam's OET writing team marks your letter against all six criteria — including Purpose — and returns an annotated PDF showing exactly where your opening can be sharper.
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