Band 7.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 7.0 · IELTS Momentum Workout · 2026-09-01

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 7.0)

The given diagram illustrates the operational mechanics of a robotic arm and highlights the structural similarities between its joints and those of human arm.

Overall, the mechanical arm is a computer driven system powered by three distinct motors that manipulated a central base, an anatomical style arm, and an end-effector. The system mimics human arm movements to perform various industrial tasks.

At the foundational level, the setup features a base that is typically stationary but can occasionally move. Affixed to this base is a pivot that allows the entire arm to rotate, alongside a shoulder joint responsible for raising and lowering the arm assembly. Movement is facilitated by a computer system that provides precision control to three individual motors. One motor controls the elbow joint, which mimics human flexibility and allows general movement.

The remaining motors govern the terminal parts of the arm. The wrist joint enables the gripper to flex and rotate, just like a human wrist. The standard attachment is gripper equipped with built-in sensors to regulate griping force. However, this terminal component can be swapped out for alternative end- effectors depending on the industrial requirement, such as spray painters, drill for making holes, or welding tools for melting metal.

AI examiner evaluation

Task Achievement / Task Response — Band 7.0

The response effectively addresses the prompt by describing the mechanical arm and its functional similarities to human anatomy. You have successfully identified the main features, such as the base, joints, and end-effectors, and made relevant comparisons. The overview is clear and sets the stage for the detailed description. To reach a higher band, ensure that the comparison between the mechanical joints and human joints is slightly more explicit throughout the body paragraphs, rather than just mentioning it in the introduction and briefly in the elbow description. Overall, the information is well-selected and covers the requirements of the task.

Coherence and Cohesion — Band 7.5

The essay is logically organized, with a clear progression from the general system overview to specific components like the base, joints, and end-effectors. Paragraphing is used effectively to separate these distinct areas. Cohesive devices such as 'At the foundational level', 'Alongside', and 'The remaining motors' are used appropriately to guide the reader through the text. The flow is smooth, and the relationship between ideas is clear. There is no evidence of mechanical or repetitive use of linking words, which demonstrates a good level of control over the structure of the report.

Lexical Resource — Band 6.5

You demonstrate a good range of vocabulary appropriate for a technical description, using terms like 'operational mechanics', 'end-effector', and 'anatomical style'. There are some minor issues with word choice and collocation, such as 'manipulated a central base' (where 'manipulates' or 'controls' would be more accurate) and 'gripper equipped' (which is missing an article). However, these errors do not impede communication. The use of technical terminology is generally accurate and adds precision to your description of the robotic system.

Grammatical Range and Accuracy — Band 6.5

The response uses a mix of simple and complex sentence structures effectively. Most sentences are error-free, and the grammar is generally sound. There are a few minor slips, such as 'human arm' (missing an article: 'a human arm') and 'drill for making holes' (should be 'drills' to match the plural 'spray painters'). Punctuation is generally accurate, and the sentence variety helps maintain the reader's interest. The control over complex structures is sufficient to convey information clearly without significant grammatical interference.

See this exact question answered at other band scores — the same prompt compared across bands.

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