Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · IELTS Momentum Workout · 2026-08-02

IELTS Writing Task 1 question

The diagram below shows how a mechanical arm works, and how the joints that make up the arm function in the same way as those in a human arm. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Student answer (Band 8.5)

The diagram illustrates the structure and operation of a mechanical arm, showing how its joints perform functions similar to those of a human arm and how its movements are controlled.

Overall, the mechanical arm consists of a stationary or movable base, several motor-driven joints and a gripper or other interchangeable tools. All of its movements are directed by a computer that precisely controls the motors, enabling the arm to carry out a wide range of industrial tasks.

At the bottom of the arm is a base connected to a pivot, which allows the entire arm to rotate. Above this, the shoulder joint raises and lowers the arm, while the elbow provides flexibility by enabling it to bend. near the end of the arm, the wrist rotates the fripper or any attached end-effector to the required position. Each of these joints is powered by an individual motor, with all motors receiving instructions from a central computer to ensure accurate and coordinated movement.

At the tip of the ar is a gripper fitted with built-in sensors that regulate the amount of force applied when handling objects. Alternatively, the gripper can be replaced with specialised end-effectors, such as spray-painting equioment, drilling tools or welding devices, allowing the arm to perform various manufacturing operations efficiently and precisely.

AI examiner evaluation

Task Achievement / Task Response — Band 8.5

The response effectively addresses the prompt by summarizing the mechanical arm's structure and function. You have successfully identified the main features, such as the base, joints (shoulder, elbow, wrist), and the end-effectors, while making relevant comparisons to human anatomy as requested. The overview is clear and provides a good summary of the system's operation. All parts of the task are covered well, and the information is presented in a logical, analytical manner suitable for an Academic Task 1 response. No information is missing, and the level of detail is appropriate for the task requirements.

Coherence and Cohesion — Band 8.5

The response is well-organized with a clear progression of ideas. You have used paragraphing effectively to separate the general overview from the specific mechanical details. Cohesive devices such as 'Overall', 'At the bottom of', 'Above this', and 'Alternatively' are used naturally to guide the reader through the description. The flow between sentences is smooth, and the logical sequencing of the arm's components—from the base up to the end-effector—makes the technical information easy to follow. The structure is coherent throughout.

Lexical Resource — Band 8.0

You demonstrate a good range of vocabulary appropriate for a technical description, using terms like 'stationary', 'interchangeable', 'end-effector', and 'coordinated movement' accurately. There is a high level of precision in your word choice. While there are a few minor slips, such as 'fripper' (a typo for gripper) and 'ar' (a typo for arm), these are clearly mechanical errors rather than a lack of vocabulary knowledge. The use of domain-specific terminology is strong and enhances the clarity of your report.

Grammatical Range and Accuracy — Band 8.0

The response displays a good variety of complex sentence structures, such as the use of participial phrases ('enabling the arm to carry out...') and relative clauses ('which allows the entire arm to rotate'). Most sentences are error-free, and the grammar is generally accurate. There are a few minor spelling errors ('equioment' instead of 'equipment', 'ar' instead of 'arm'), but these do not impede communication or affect the overall readability. Your control over punctuation and sentence construction is consistent and effective.

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