Band 5.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 5.0 · IELTS Momentum Workout · 2026-10-13

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 5.0)

The diagram shows a computer system which consists of motor, a gripper which is a built-in sensor control force, elbow which allows movement and gives flexibility, a wrist which allows gripper to flex or rotate, a pivot which enables arm to rotate, a shoulder which raises or lowers the arm and a base usually movable.

If we see it from the human eye, its comparable to the human eye but the difference lies in the movement and flexibility. The mechnical arm works entirely on computer system which control each and everything while human arm is controlled with its brain. Another big difference is its size it has a huge size as compare to human arm which is relatively smaller.

While human arm consists of bones, joints and muscles it operates flawlessly and can feel the heat and water and react if something is sensitive.

Human arm doesn't need a base or moveable stationary as mechnical arm needed.

AI examiner evaluation

Task Achievement / Task Response: Band 4.5

The response identifies several labelled parts and their functions, including the elbow, wrist, pivot and shoulder, so it shows some understanding of the diagram. However, it only partially reports the visual information: it does not explain that the computer controls three motors or describe how the arm is arranged from the base through the shoulder and elbow to the gripper. The alternative end-effectors—spraying paint, drilling and welding—are also omitted. Much of the response shifts to unsupported comparisons with a human arm, such as claims about relative size and sensing heat or water, rather than summarising the diagram. A clearer overview of the machine’s control and movement, followed by accurate details of its components and uses, would address the task more fully.

Coherence and Cohesion: Band 5.0

The response has some organisation: it begins by listing machine components and then moves to comparisons with the human arm. Paragraph breaks help distinguish these topics. However, there is no clear overall progression through the diagram, and the component list does not explain how the parts connect or operate together. The transition “If we see it from the human eye” is unclear, while “While human arm consists…” introduces another point without showing how it relates to the previous comparison. Repeated use of “human arm” and “another big difference” also makes the development feel list-like. Grouping the description into control, structure and functions, and using clear links between these stages, would improve cohesion.

Lexical Resource: Band 5.5

The response uses relevant technical vocabulary such as “gripper,” “motor,” “pivot,” “flexibility” and “sensor,” and it communicates several component functions. This gives it a workable range for describing the subject. However, some word choices and collocations are inaccurate or awkward, including “a built-in sensor control force,” “from the human eye,” and “as compare to human arm.” “Mechnical” is also misspelled twice, and “computer system” is repeated where more precise wording could describe the control system. Aim for accurate technical phrasing and natural comparison language; for example, describe sensors as controlling the force applied by the gripper and say that the arm is larger than a human arm only if the diagram supports that comparison.

Grammatical Range and Accuracy: Band 5.0

The response attempts both simple and more complex sentences, including the contrast beginning “While human arm consists of bones, joints and muscles…”. However, grammatical errors occur frequently enough to make some relationships unclear. Examples include missing articles in “consists of motor” and “human arm,” the faulty comparison “as compare to human arm,” and the agreement error in “computer system which control each and everything.” The sentence beginning “While” is also incomplete as a standalone construction, and “Human arm doesn't need a base or moveable stationary as mechnical arm needed” has an unclear structure and missing verb forms. Practise article use, subject–verb agreement, and complete comparative sentences, while checking that each sentence has a clear main clause.

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