How to Write Critical Analysis in an Essay (With Examples)

Ask any university lecturer what separates a First class essay from a 2:1, and they will almost always say the same thing: critical analysis. It's the skill mentioned most in marking criteria, most often missing from student work, and most frequently misunderstood.

This guide explains what critical analysis actually means in an essay — not in the abstract, but with concrete techniques and before/after examples you can apply immediately.

What critical analysis actually means

Students often think "critical" means finding fault with arguments. It doesn't. Critical analysis means evaluating an argument — assessing its strength, identifying its assumptions, understanding its limits, and situating it in a broader debate.

A critical thinker asks:

• What assumptions does this argument rest on?
• Under what conditions would this argument fail?
• What does this argument leave out?
• What would someone who disagrees say — at their strongest?
• What is the significance of this argument for the broader question?

Critical analysis is not the same as disagreeing. You can critically engage with an argument you agree with — by identifying where it succeeds and why, and what its limits are.

The three levels of engagement

It helps to think of engagement with sources in three levels:

Most students write at level 2. First class essays operate at level 3 consistently — not in every sentence, but in every significant claim.

Five techniques for critical analysis

1. Identify and test the underlying assumption

Every argument rests on assumptions — things it takes for granted. Critical analysis makes these visible and asks whether they hold.

Before: "Market competition drives innovation, which benefits consumers through lower prices and better products."

After: "Market competition drives innovation — but this claim assumes that innovation is consumer-oriented and that competitive markets prevail. In concentrated industries like pharmaceuticals, competition may instead drive patent hoarding and regulatory arbitrage rather than product improvement."

2. Apply the argument to a case where it might fail

A strong argument works in most cases. Critical analysis tests it on hard cases — cases where the conditions are different, the stakes are higher, or the assumptions don't hold.

Before: "Democratic institutions prevent the concentration of political power."

After: "Democratic institutions generally prevent the concentration of political power — but Levitsky and Ziblatt's study of democratic backsliding suggests this depends on informal norms as much as formal rules. When norms of mutual toleration erode, as in Hungary after 2010, legal democratic procedures can become instruments of authoritarian consolidation."

3. Put two sources in dialogue

One of the most powerful critical moves is to use one theorist to complicate or challenge another — rather than citing each one separately.

Before: "Rawls argues for distributive justice based on the difference principle. Sen argues that justice requires attention to capabilities."

After: "Where Rawls grounds justice in primary goods — the resources needed to pursue any conception of the good life — Sen objects that individuals' ability to convert resources into functioning differs dramatically. A person with a disability may require far more resources than a healthy person to achieve equivalent capability. This critique exposes a tension in Rawlsian liberalism between formal equality of resource distribution and substantive equality of outcome."

4. Acknowledge the best version of the counter-argument

Many students dismiss counter-arguments too quickly. The examiner knows what the best version of the counter-argument is — if you don't engage with it at its strongest, it looks like you don't know it either.

Weak counter-argument engagement: "Some argue that globalisation has increased inequality, but the data shows overall GDP growth."

Strong counter-argument engagement: "The most serious challenge to the globalisation-growth thesis comes from Milanovic's analysis of global income distribution, which shows that while the global middle class has grown substantially, within-country inequality has risen sharply in advanced economies — creating a political backlash that may ultimately undermine the trade openness that enabled growth. This is not a weak objection: it points to a genuine tension between aggregate and distributional effects."

5. Explain the implications

Critical analysis doesn't just evaluate arguments — it draws out their significance. What follows from this argument being right? What would change if it were wrong?

Before: "Climate change poses significant risks to global economic stability."

After: "If climate risk is systematically mispriced in financial markets — as central bank stress tests increasingly suggest — the transition to net zero may trigger a financial crisis more severe than 2008, with stranded fossil fuel assets serving the same role as subprime mortgage-backed securities. This implication transforms climate change from an environmental problem into a macro-prudential one, requiring a regulatory response that current frameworks are not designed to deliver."

What critical analysis looks like in practice

A good rule of thumb: for every claim you make, write one sentence that complicates it. Not to undermine your argument — but to show that you understand its limits. Examiners reward intellectual honesty about what an argument can and cannot show.

Using FirstClass to develop critical thinking

One of the most useful features of FirstClass is the sentence heatmap, which colour-codes every sentence in your essay by type. Purple sentences are critical thinking; green are analytical; amber are descriptive. Most students, when they see their essay mapped, are surprised by how much amber there is — and how little purple.

The annotation feature then gives you an examiner question for each highlighted sentence — asking specifically what's missing. For descriptive sentences, it asks what mechanism or implication you haven't explained. For analytical sentences, it asks which theorist challenges this, or what the counter-argument is.

This is the closest thing to a tutorial with a real examiner that most students can access.