You can nail your introduction. Your grammar can be flawless. Your ideas can be original and interesting. But if your evidence is vague, weak, or too general, you're getting marked down. Period.
This is where most students stumble. They spend 40 minutes on an IELTS Writing Task 2 essay and fill it with sentences like "Many people think social media is bad." That's not evidence. That's an opinion with no foundation. The difference between a Band 6 and a Band 7 or 8 usually comes down to one thing: how specific and relevant your supporting details actually are.
Let me show you how examiners actually evaluate evidence, and more importantly, how you can strengthen yours before you hit submit. Our IELTS writing checker scores essays based on evidence strength, but understanding the principles first gives you control over your own writing.
The IELTS band descriptors are clear about what they want. At Band 7, you need "fully developed ideas with relevant, specific examples." At Band 6, ideas are "clearly presented" but examples might be "adequate" rather than strong. That gap between adequate and specific costs you real points.
When examiners read your essay, they ask one question: "Does this example actually prove the point?" If the answer is "maybe" or "sort of," you're not hitting a 7. You're sitting at a 6 or lower.
Vague supporting details also hurt your Coherence & Cohesion score. If your reader can't see the line connecting your claim to your evidence, they can't follow your logic. That's a double penalty on your overall band.
Weak: "Technology has changed society. People now use computers for work. This shows how important technology is."
No specific example. No real detail. It's floating in abstraction.
Here's what the gap looks like in actual IELTS-style writing.
Question: "Some people believe social media has had a negative effect on teenagers. To what extent do you agree?"
Weak: "Social media is bad for teenagers' mental health because it causes stress and anxiety."
You've told the examiner what you think, but not why. There's no mechanism. No proof. No concrete detail to hold onto.
Strong: "Teenagers on social media are exposed to constant comparison with carefully curated versions of their peers' lives, which research suggests triggers cortisol spikes and reduced self-esteem, particularly among girls aged 13-16."
Now you see the mechanism. You've named a specific age group, mentioned a biological response (cortisol), and referenced research backing. That's a claim worth believing.
Question: "Some argue remote work increases productivity. Do you agree?"
Weak: "People work better from home because they don't have distractions."
What distractions? Which people? This could mean anything to anyone.
Strong: "Software developers working from home eliminate commute time (averaging 45 minutes daily in major cities) and office interruptions from colleagues, allowing them to enter deeper focus states on complex coding tasks. However, this benefit doesn't extend equally to roles requiring real-time collaboration, such as design teams or client-facing positions."
You've added numbers. Named specific job types. Even included a counterpoint. Examiners see nuanced thinking and real understanding.
Question: "Should governments prioritize environmental protection or economic growth?"
Weak: "Environmental protection is important because climate change is a serious problem."
You're just repeating the prompt. You're not proving anything.
Strong: "Costa Rica invested heavily in renewable energy (99% of electricity from hydroelectric and wind power by 2022) while maintaining 6% annual GDP growth, demonstrating that environmental regulation and economic productivity aren't necessarily opposing forces."
Now you have a real case study with specific numbers. This is what moves you from Band 6 to Band 7.
Not all weak evidence fails the same way. Recognizing these patterns helps you strengthen your IELTS essay before submission.
You write something that sounds like evidence but is actually just your opinion wearing a different shirt.
Weak: "Online shopping is more convenient." (For whom? In what situation?)
Strong: "Office workers using meal delivery apps save an average of 30 minutes daily on lunch procurement, time they can redirect to work tasks or breaks." (Specific group, measurable benefit, clear outcome.)
Your example could apply to almost anything. It lacks teeth.
Weak: "Many countries have implemented policies to reduce pollution." (Which countries? What policies? What type of pollution?)
Strong: "Germany's Energiewende policy mandated 80% renewable energy by 2050, leading manufacturers like Siemens to develop green technology divisions that employ 100,000+ workers." (Specific country, specific policy, specific outcome with numbers.)
You say X causes Y without showing how or why.
Weak: "Video games harm children's development because they spend too much time on screens." (Correlation, not causation. You haven't explained the mechanism.)
Strong: "Excessive gaming (20+ hours weekly) reduces time spent on physical activity, leading to weaker motor skill development in primary school children; however, studies show strategic games improve spatial reasoning and problem-solving speed." (You've named the mechanism, given a threshold, cited outcomes, and shown nuance.)
You're describing what "could happen" instead of what actually does happen.
Weak: "If people used public transport more, traffic congestion might decrease." (It might. But that's not evidence.)
Strong: "Singapore's expansion of the Mass Rapid Transit system to 230 kilometers reduced private car usage by 8% between 2010 and 2020, directly lowering peak-hour congestion on major highways." (This actually happened. You've measured the result.)
Quick check: For every example you write, ask yourself: "Could someone Google this and verify it?" If the answer is no, it's too vague. You don't need footnotes, but your evidence should be grounded in reality, not floating in abstraction.
You need a framework you can actually use during your 40-minute exam. Here it is.
For every supporting example, include at least three of these four elements:
You don't need all four for every sentence. But the more you include, the stronger your example becomes.
Take something you wrote recently. Maybe "Urbanization has negative effects." Now add at least two of the four elements. Watch what happens.
Before: "Urbanization causes environmental damage."
After: "Between 2000 and 2020, rapid urbanization in Mumbai and Delhi consumed 15% of surrounding farmland annually, reducing agricultural output by 25% while increasing air pollution from construction vehicles and vehicle emissions by an estimated 300%." (You've added who/what, numbers, mechanism, and a timeframe.)
That's the difference. Not wordiness. Specificity.
You won't have time to completely rewrite during the exam. But you can do a quick quality check in the last few minutes.
Read through each paragraph's supporting detail and ask yourself:
If you answer "no" to more than one, that's a red flag. Rewrite if you can. Even one sentence added with more detail helps.
Time strategy: Don't spend 35 minutes on your first draft. Aim for 30-32 minutes of writing, which leaves you 8-10 minutes for checking and strengthening weak evidence. Those 10 minutes can mean the difference between a Band 6.5 and a Band 7. Use our IELTS essay checker during practice to see exactly where your evidence falls short.
Understanding what examiners expect helps you see what to aim for.
Band 6: Ideas are present but supported by general examples. "Young people often struggle with unemployment" instead of "In 2023, unemployment among 16-24 year-olds in the UK was 10.8%, compared to 4.1% for the general population."
Band 7: Ideas are supported by specific, relevant examples with real detail. You'd write: "Between 2019 and 2023, the number of freelancers in the gig economy grew by 28% in developed nations, indicating a shift in employment preferences among young workers." That's specific and it carries weight.
Band 8: Examples are precise, directly relevant, and show nuanced understanding. You'd follow up with: "However, research shows this growth doesn't reflect preference but rather employer strategy to reduce benefit costs, as 60% of gig workers earn below local minimum wage when benefits are factored in."
The difference isn't vocabulary or grammar. It's how well you prove your point.
Some question types make weak evidence easier to spot than others.
Agree/Disagree Essays: You need examples proving your position works or the opposing position fails. Instead of "University education is important," try: "University graduates earn 34% more over their lifetimes than high school graduates, according to OECD data." That's specific evidence for your position.
Advantages/Disadvantages Essays: You need real examples of what advantages and disadvantages actually occur. "A disadvantage of remote work is isolation" is weak. "A disadvantage of remote work is social isolation; a survey of 2,000 remote workers found 38% reported increased anxiety and loneliness, particularly among workers living alone." That's solid.
Opinion Essays: You need examples that support your specific opinion, not just the topic generally. Don't write "Technology is good." Write "Telemedicine increased healthcare access in rural India by 45% between 2018 and 2022, reducing treatment delays for acute conditions."
Problem/Solution Essays: You need evidence that the problem is real and that your solution actually addresses it. "Traffic is a problem in cities. We should build more subways. The London Underground reduced commute times by 22 minutes average per user since 1990." You've proven both the problem's severity and that your solution works.
Examiners don't care if your examples come from your life or from research. They care if your examples are real, relevant, and specific.
You can reference a case study from a documentary. You can mention statistics you remember from news articles. You can cite historical events. You don't need formal citations.
What you can't do is invent facts, make up statistics, or describe imaginary situations as real. If you say "75% of people prefer working from home" but you're guessing, that's a problem. If you say "Research suggests around 75% of surveyed workers prefer remote work," that's safer and honest.
The best approach? Use real information you actually know. If you're unsure, soften your language: "Studies suggest," "Research indicates," "Evidence shows." These phrases let you reference information without making false claims.
During IELTS prep: Read news articles, government reports, and BBC summaries on your essay topics. This builds a real reservoir of examples you can draw from during the exam. When you know actual facts, your evidence automatically becomes stronger because you write with confidence. Check your examples with an IELTS writing task 2 checker during practice tests.
You can stay somewhat general only if you add other strengths, like explaining the mechanism clearly or showing nuanced understanding. A Band 6 essay might say "many countries have adopted green energy." A Band 7 essay says "Denmark generates 80% of its electricity from wind power, proving renewable energy is viable at scale." Specificity is one of the fastest ways to lift your score without writing more.
The rule: if you could remove your example and replace it with a different one without changing your main point, it's too general. Strong examples prove your exact claim, not just your topic.
Our IELTS writing checker evaluates how strong your supporting details are, identifies vague claims, and shows you exactly how to strengthen them for a higher band score.
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