Band 4.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.0 · IELTS Momentum Workout · 2026-11-11

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 4.0)

The process diagram illustrates how a mechanical arm works and how the funtionality of the arm is similar to human arm.

Overall, the diagram followed a man-made process and this is a linear process diagram. it show all the required step to present how a machine are work.

All the motors control by computer and three motor required for the process. The first motor placed in showlder of the machine are, which will help in movement. Second motor req

AI examiner evaluation

Task Achievement / Task Response: Band 3.0

The opening identifies the subject as a mechanical arm, and you attempt an overview by calling it a process. However, the response does not adequately summarise the diagram’s main features: it stops while describing the motors and does not explain the shoulder, pivot, wrist, gripper, or alternative end-effectors. The claim that this is a “linear process” is also not a useful description of a diagram showing components and their functions. The response contains 71 words, below the required 150; the eight words copied from the prompt are excluded from that count. To improve, give a clear overview of how computer-controlled motors operate the arm’s joints, then describe the key parts and their functions, including the possible tools attached to it.

Coherence and Cohesion: Band 4.0

There is a basic attempt to organise the response: an introductory sentence is followed by an overview and then a detail paragraph beginning with the motors. The sequence from the computer to the motors could provide a logical starting point. However, the explanation ends abruptly at “Second motor req”, so there is no complete progression through the arm or a concluding description of its functions. The overview also repeats the idea of a process without clarifying how the information is organised. Use separate paragraphs for the overall structure and the component details, and connect each part in a clear order—for example, from the base and shoulder up to the gripper. Complete sentences and transitions would make the relationships easier to follow.

Lexical Resource: Band 5.0

The response uses some relevant topic vocabulary, including “mechanical arm”, “motors”, “computer”, and “movement”, so the reader can identify the general subject. However, the range is limited and several choices are inaccurate or awkward, such as “the functionality of the arm is similar to human arm” and “a man-made process”. “Linear process” does not precisely describe the diagram, which presents components and their functions rather than a sequence of production stages. There is also a spelling error in “funtionality”. Build a more precise set of terms from the diagram, such as “joint”, “pivot”, “flex”, “rotate”, and “end-effector”, and use them to describe what each component does.

Grammatical Range and Accuracy: Band 4.5

The response attempts both simple statements and a relative clause, as in “which will help in movement”, but grammatical control is inconsistent and the range remains limited. Errors include “the diagram followed” instead of a suitable present-tense form, “it show”, “All the motors control by computer”, and “three motor required”. These involve tense, subject–verb agreement, missing auxiliary verbs, and plural forms. The sentence “Overall, the diagram followed a man-made process and this is a linear process diagram” also joins ideas awkwardly, while the final sentence is incomplete. Practise accurate present-simple descriptions of diagram features, including passive forms where appropriate, and check each sentence for a clear subject and verb before moving on.

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

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