Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · IELTS Momentum Workout · 2026-07-30

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 design and operation of a mechanical arm that replicates the movements of a human arm through computer-controlled motors and interchangeable end-effectors.

Overall, a computer precisely controls three separate motors, which in turn regulate the movement of the arm's joints. In addition, the arm's gripper can be replaced with alternative tools depending on the task required.

Looking at the structure in more detail, the arm is attached to a base, which normally remains stationary but can occasionally be moved. A pivot at the base enables the entire arm to rotate. The shoulder motor is responsible for raising and lowering the arm, while the elbow provides flexibility by allowing further movement. The wrist, meanwhile, enables the gripper, or any alternative end-effector, to flex and rotate as needed.

At the end of the arm, the gripper contains built-in sensors that control the amount of force applied when holding an object. Instead of the standard gripper, the arm can also be fitted with other tools, such as a spray-paint gun, a drill, or a device for welding metal, allowing it to perform a wider range of industrial tasks.

AI examiner evaluation

Task Achievement / Task Response — Band 8.5

The response effectively addresses all requirements of the task. You have provided a clear overview of the mechanical arm's operation and successfully highlighted the key features, such as the motor-controlled joints and the interchangeable end-effectors. The comparison to human arm functionality is well-integrated, and the description of the specific components—base, shoulder, elbow, and wrist—is accurate and logical. The information is well-selected, and you have successfully summarised the main features without unnecessary detail, meeting the requirements for a Band 8.0 performance.

Coherence and Cohesion — Band 8.5

The response is logically organised, with a clear progression from the general overview to specific structural details. Paragraphing is used effectively to separate the overview, the structural components, and the functional capabilities. Cohesive devices such as 'In addition', 'Looking at the structure in more detail', and 'meanwhile' are used naturally to guide the reader through the text. The flow of information is smooth, and the relationship between the mechanical parts and their functions is clearly established throughout the report.

Lexical Resource — Band 8.0

You demonstrate a good range of vocabulary appropriate for a technical description. Terms such as 'interchangeable end-effectors', 'flexibility', 'stationary', and 'industrial tasks' are used accurately. The language is precise and fits the context of the diagram well. While the vocabulary is sufficient and precise, it could be slightly more sophisticated to reach the highest band, but it is certainly strong enough for a Band 7.5 or 8.0. There are no noticeable errors in word choice or collocation.

Grammatical Range and Accuracy — Band 8.5

The response displays a high level of grammatical control. You have used a variety of complex sentence structures, such as 'The shoulder motor is responsible for raising and lowering the arm, while the elbow provides flexibility by allowing further movement.' Punctuation is accurate, and the majority of sentences are error-free. The control over verb tenses and clause structures is consistent throughout the text, indicating a strong command of English grammar suitable for an Academic Task 1 response.

Browse more IELTS Writing model answers or get your own writing scored by the same AI examiner.