Band 8.5 model answer: advantages and disadvantages

A band 8.5 model answer to a real IELTS Writing Task 2 question, with the paragraph plan that fits it. Aim for 250 to 290 words in 40 minutes.

The question

In many countries, the use of biometric payment methods, such as fingerprint or facial recognition at checkout, is becoming increasingly common instead of cash or cards. What are the advantages and disadvantages of this development?

Your 4-paragraph plan

Introduction (40-50 words). Paraphrase the topic and say whether the benefits outweigh the drawbacks.
Body paragraph 1 (80-100 words). The strongest advantage, developed with a concrete example.
Body paragraph 2 (80-100 words). The main disadvantage, developed honestly, then weighed against the advantage.
Conclusion (40-50 words). State your overall judgement: which side wins and why.

The trap in this question type

The question usually asks whether the advantages OUTWEIGH the disadvantages. Answer that comparison directly, not just a list of each.

Band 8.5 model answer

350 words, the length a strong candidate produces in the 40 minutes Task 2 allows (the minimum is 250). Written for this exact question in the official format. Read it once for ideas, then write your own before comparing.

Supermarkets in Sweden and convenience store chains in China already allow shoppers to pay simply by scanning a palm or a face, and this shift away from cash and cards is likely to accelerate. While the technology offers genuine gains in speed and security, it also raises concerns that deserve equal attention before it becomes the default. The principal advantage is convenience combined with reduced fraud. A fingerprint cannot be left behind in a taxi or skimmed by a hidden card reader, which makes biometric payment considerably harder to counterfeit than a PIN or signature. For a commuter buying a coffee before catching a train, a one second facial scan removes the fumbling for change or cards that slows down queues at peak hours. Retailers benefit too, since faster checkout lines mean more customers served per hour and lower losses from stolen card numbers, a cost that banks currently pass on to merchants through transaction fees. The disadvantages, however, centre on privacy and exclusion. Biometric data, unlike a password, cannot be changed if it is stolen; once a database of fingerprints or facial maps is breached, those individuals are vulnerable for life rather than until their next card renewal. There is also the question of who controls this information, since a retail chain or a third party payment processor could in principle build a detailed profile of a person's spending habits linked irrevocably to their identity. A further concern is exclusion of those without smartphones, reliable internet, or simply a willingness to be scanned, including elderly customers in rural Japan who still prefer cash transactions precisely because they leave no digital trace. On balance, biometric payment should be welcomed as an option rather than imposed as the sole method. Its speed and fraud resistance make it attractive for routine, low value purchases, but cash and card systems ought to remain available so that privacy conscious or less technologically connected customers are not forced out of ordinary commerce. Policymakers who encourage this transition should therefore pair it with strict data protection rules and a guaranteed right to pay by conventional means.

Why this answer earns band 8.5

The phrase "deserve equal attention before it becomes the default" in the introduction signals a balanced stance, addressing Task Response by setting up equal treatment of both sides.
The topic sentence "The principal advantage is convenience combined with reduced fraud" gives each body paragraph a single controlling idea, aiding Coherence and Cohesion.
The collocation "fraud resistance" and phrase "transaction fees" show precise, varied vocabulary suited to a financial topic, demonstrating Lexical Resource.
The conditional structure "once a database of fingerprints or facial maps is breached, those individuals are vulnerable for life rather than until their next card renewal" shows controlled complex grammar with accurate subordination, illustrating Grammatical Range and Accuracy.
The concluding recommendation "should therefore pair it with strict data protection rules" ties the conclusion back to both advantages and disadvantages discussed, reinforcing Task Response through a reasoned final position.

The plan, reusable on any question of this type

Introduce biometric payment as a growing trend with concrete examples and state that both benefits and drawbacks merit equal weight (~57 words)
Explain the advantage of speed and reduced fraud with a commuter example and a retailer cost argument (~99 words)
Explain the disadvantage of irrevocable privacy loss and exclusion of certain groups such as elderly rural customers (~116 words)
Conclude with a balanced recommendation that biometric payment remain optional alongside cash and cards (~78 words)

Phrases worth learning

deserve equal attention before	to signal a balanced two-part discussion in any advantages/disadvantages essay
a cost that banks currently pass on to merchants	to introduce a hidden economic consequence in essays about business or technology
unlike a password, cannot be changed if it is stolen	to contrast a new risk with a familiar one in any technology essay
There is also the question of who controls	to raise a governance or accountability concern on any topic involving data or power
should be welcomed as an option rather than imposed as	to propose a middle-ground policy recommendation in any opinion essay

Questions about this answer

What band is this model answer?

It is written to band 8.5, and the notes under it quote the answer's own words to show why.

How long should my answer to this question be?

Write at least 250 words and aim for 250 to 290 in the 40 minutes Task 2 allows. This model answer is 350 words.

What is the most common mistake on a advantages and disadvantages question?