Comparing Rousseau with Hobbes and Locke is one of the most common assignments in introductory political theory. It is also one of the easiest to do badly, because students tend to write three mini-summaries and call it a comparison. A strong essay instead organizes the discussion around a shared question, such as why people leave the state of nature or what makes political authority legitimate. Grading should reward that kind of organizing idea more than accurate recall.

The three thinkers share the language of the social contract but disagree on almost everything underneath it. Hobbes grounds the contract in fear and the need for a sovereign who can end the war of all against all, while Locke emphasizes natural rights and limited government. Rousseau, by contrast, argues that the contract creates a collective sovereign whose general will cannot be represented. A good comparison explains how these premises produce different political conclusions.

Before assigning the essay, decide which comparative skills you want to see and tell students directly. Some instructors want an argument about which thinker offers the best account of freedom, while others want an analytic comparison that stays neutral. These are different tasks with different grading standards, and students who are not told which one applies often split the difference and satisfy neither. Clarity in the prompt reduces confusion in the grading.

What separates a comparison from three summaries

The clearest sign of a weak comparative essay is a structure that treats each thinker in a separate block with a brief comparison tacked on at the end. A stronger structure moves through issues, such as the state of nature, consent, property, and sovereignty, and discusses all three thinkers within each section. This forces the student to hold the thinkers in relation to one another. When grading, check whether the paper actually makes claims that depend on more than one author.

• Organizes the essay around a shared question rather than around individual authors
• Represents each thinker accurately, including the points where Rousseau departs from both rivals
• Uses specific passages from each text rather than general reputation
• Explains why the thinkers disagree, not only that they do
• Reaches a conclusion that the comparison actually supports

Common errors specific to this comparison

Students frequently flatten Rousseau into a milder version of Locke, overlooking his insistence that sovereignty is inalienable and cannot be delegated to representatives. Others assume Hobbes and Rousseau agree because both defend strong political authority, which ignores that Rousseau places that authority in the people rather than a monarch. Another frequent mistake is reading the state of nature as a historical claim rather than a thought experiment. Naming these errors in your rubric helps you grade them consistently.

It is worth deciding in advance how much credit a paper earns when its interpretation of one thinker is shaky but its comparative structure is strong. Many instructors weight interpretation most heavily and treat structure as a secondary criterion, but this is a choice you should make deliberately. Writing the decision into the rubric prevents drift as you move through a large stack. It also gives you a clear answer when a student asks why a well-organized paper received a modest score.

Feedback that pushes comparison further

Useful comments on comparative essays tend to ask a question rather than issue a correction. Writing "You say Hobbes and Rousseau both defend strong authority; what is different about who holds it?" nudges the student toward the distinction without handing it over. These prompts are especially valuable on drafts, where the student still has time to restructure. Over multiple rounds, they learn to anticipate the question themselves.

When the volume of papers is high, consider flagging the three most important comparative gaps rather than annotating every paragraph. Students absorb a short list of priorities better than a dense page of marginal notes. An AI grading assistant set up with your rubric can draft these priority comments so you can review and refine them. The goal is a response that is specific, honest, and short enough to be read.

Building the assignment into a larger unit

A comparative essay lands better when students have already practiced short comparisons in class. A ten-minute exercise where pairs map Hobbes, Locke, and Rousseau onto a simple table of premises and conclusions prepares them for the longer paper. You can then use the same table as a pre-writing tool and a grading reference. Students see that the essay is an extension of work they have already done.

Finally, keep a record of the strongest and weakest comparative moves you see each term. These examples, anonymized, become valuable teaching material for future classes and for new graders joining your course. Over a few semesters, you will have a clear sense of what excellent work looks like and why. That shared understanding is what makes grading fairer across sections and instructors.