Band 6.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 6.5 · IELTS Momentum Workout · 2026-09-05

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 6.5)

The diagram illustrates the structure and functions of an industrial robotic arm, which is operated by a computer to perform various tasks with high precision.

Overall, the robotic arm consists of a stationary base, several motors, movable joints, a wrist and a gripper. Different end-effectors can also be attached to the arm, allowing it to perform specialized industrial activities.

The base supports the entire mechanism and can occasionally be moved. Above it, a shoulder joint raises or lowers the arm, while a pivot enables the arm to rotate. The elbow provides flexibility and allows further movement. Three motors, controlled precisely by a computer, power these movements. At the end of the arm, the wrist permits the gripper or another end-effector to rotate. The gripper contains built-in sensors that control the applied force, enabling it to handle objects safely. Alternatively, the gripper can be replaced with tools designed for spray painting, drilling holes or welding metal.

AI examiner evaluation

Task Achievement / Task Response — Band 6.0

The response successfully identifies the main features of the robotic arm, including its components and their functions. You have clearly described the base, joints, motors, and end-effectors. However, the prompt specifically asks for comparisons to the human arm, which is a key part of the task. While you mention the joints, you do not explicitly compare the mechanical arm's movements to those of a human arm (e.g., shoulder, elbow, wrist). Including these comparative details would have provided a more comprehensive overview and better addressed the prompt's requirements. The overview is clear, but the lack of explicit comparison limits the score.

Coherence and Cohesion — Band 7.0

The response is logically organized, moving from a general introduction to specific components and their functions. Paragraphing is used effectively to separate the overview from the detailed description. Cohesive devices such as 'Above it', 'while', and 'Alternatively' are used appropriately to guide the reader through the mechanism. The flow of information is smooth, and the progression of ideas is easy to follow. There is a clear sense of structure, and referencing is accurate throughout the text. The use of cohesive devices is natural and does not feel forced.

Lexical Resource — Band 6.5

You demonstrate a good range of vocabulary relevant to the topic, such as 'industrial robotic arm', 'end-effectors', 'mechanism', and 'precision'. The terminology is accurate and appropriate for a technical description. There are no significant spelling or word-choice errors. While the vocabulary is sufficient and precise, it could be further enhanced by incorporating more sophisticated collocations or varied descriptive language to reach a higher band. Overall, the lexical range is adequate for the task and allows for clear communication of technical concepts.

Grammatical Range and Accuracy — Band 7.0

The writing displays a good mix of simple and complex sentence structures. You have used relative clauses ('which is operated by', 'that control the applied force') and compound sentences effectively. The grammar is largely accurate, with no major errors that impede understanding. Punctuation is handled correctly, and the sentence construction is varied enough to maintain interest. The control over complex structures is consistent, and the majority of sentences are error-free, which reflects a solid grasp of English grammar suitable for this type of descriptive task.

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