IELTS Writing Task 2: Mixed and Cause-Effect Essays

Mixed essays combine two different task types in a single prompt. Cause-effect questions are a common variant, asking you to explain why something happens and then discuss its consequences or solutions.

These questions are often the most demanding in Task 2, because candidates must address two distinct operations without letting one swallow the other. In this guide, I will show you how to plan and structure them, and provide a complete Band 9 sample answer.

Understanding the Question

Mixed prompts typically look like this:

“In many cities, traffic congestion has become a serious problem. What are the causes of this problem, and what measures could be taken to solve it?”

Or:

“Nowadays many people suffer from stress-related illnesses. What are the reasons for this increase, and what can be done to reduce it?”

The key word here is “and”. You are being asked two things, and you must answer both. A common error is to write four paragraphs on the causes and only two sentences on the solutions. That costs you Task Response marks.

Three Variants of Cause-Effect Questions

Not all of these questions ask for the same combination. Read carefully:

Notice that “causes” and “effects” are not the same as “problems” and “solutions”. If the question asks for effects, do not write about solutions, and vice versa. This is the single most common mistake with this essay type.

The Structure

Introduction (2-3 sentences)

Paraphrase the topic and indicate that you will address both parts. For example: “Traffic congestion in urban areas has become an increasingly pressing concern. This essay will examine the principal causes of this problem before proposing a range of possible solutions.”

Body Paragraph 1: Causes (5-7 sentences)

Present two or three main causes. Explain the mechanism behind each one — not just what happens, but why it happens. Support your points with examples.

Body Paragraph 2: Effects or Solutions (5-7 sentences)

Address the second part of the question fully. If the question asks for solutions, make sure each solution you propose directly addresses a cause you identified in the first paragraph.

Conclusion (2 sentences)

Summarise both parts and restate your overall view. Do not introduce new ideas.

Band 9 Sample Answer

Question: “In many cities, traffic congestion has become a serious problem. What are the causes of this problem, and what measures could be taken to solve it?”

Introduction:

Urban traffic congestion has reached unprecedented levels in cities around the world, causing significant economic and environmental harm. This essay will examine the principal causes of this issue before proposing a range of practical measures to address it.

Body Paragraph 1 — Causes:

There are several interconnected reasons why traffic congestion has become so severe. The most significant factor is the rapid growth in private car ownership. As average incomes rise, more households can afford a vehicle, yet road infrastructure has not expanded at the same pace, resulting in chronic overcrowding. A second major cause is the lack of reliable public transport in many cities. Where bus and rail networks are infrequent or uncomfortable, people naturally prefer the convenience of driving. Furthermore, urban planning decisions have contributed to the problem: many cities have allowed residential areas to develop far from commercial centres, forcing residents to make long daily journeys.

Body Paragraph 2 — Solutions:

To address these issues, governments could take several practical steps. Firstly, investing in public transport infrastructure would make alternatives to driving genuinely attractive. Cities such as Singapore and Zurich, which have extensive and efficient transit networks, experience far lower levels of congestion than comparable cities. Secondly, congestion charging schemes — which levy a fee on vehicles entering the city centre during peak hours — have proven effective in London and Stockholm, reducing traffic volumes significantly. Finally, promoting remote working arrangements would reduce the number of commuters altogether, as has been demonstrated since the pandemic.

Conclusion:

In conclusion, congestion is caused primarily by rising car ownership, inadequate public transport, and poorly planned urban development. A combination of infrastructure investment, congestion charges, and flexible working policies would go a long way towards resolving this problem.

Useful Language for Cause-Effect Essays

Common Mistakes to Avoid

Writing about effects when the question asks for solutions. Read the prompt carefully. “What are the effects?” and “What can be done about it?” require completely different body paragraphs.

Unbalanced paragraphs. If the question asks for two things, give them roughly equal weight. Do not spend six sentences on causes and one on solutions.

Solutions that do not match the causes. Each solution you propose should logically address a cause you identified. If you say the cause is poor public transport, the solution should be investment in public transport.

Using absolute statements. Avoid phrases like “this will definitely solve the problem”. Examiners prefer measured language: “this could significantly reduce”, “this may help to alleviate”.

Practice Tips

Identify the combination before you write. Spend two minutes deciding whether the question asks for causes, effects, or solutions. Underline the key words in the prompt.

Link your ideas across paragraphs. A strong answer makes the connection between causes and solutions explicit. This shows the examiner that you can organise and develop ideas logically.

Practise with real prompts. Write at least one cause-effect essay every week under timed conditions, and compare your response to the sample structure above.

With careful planning and a clear structure, mixed and cause-effect essays can become one of your most reliable question types. Good luck!