An ordinary CLAT legal reasoning question gives you a rule and asks you to apply it. A rule derivation question runs that backwards: it gives you decided examples and asks which rule accounts for them.
That is the whole idea, and it is worth understanding whether or not it turns up in a CLAT paper — because the underlying skill is what common law reasoning actually is, and it already appears in passages that ask you to infer an unstated principle.
A caution first. Nothing has been confirmed for CLAT 2028. The Expert Committee proposed a three-section paper and the Consortium referred the recommendations onward. The term comes from the Expert Committee Report 2026 itself. Its proposed Logical Reasoning and Legal Aptitude section would require candidates "to apply given rules to supplied facts, as well as to derive rules from those facts" (p. 32), and it prints a sample set headed "Rule Derivation" (pp. 35–37). The CLAT 2028 page separates what is proposed from what is decided.
How the question type works
The question comes in two shapes, and the skill behind them is the same.
The Report's shape. The Expert Committee's sample gives one set of facts (a cyclist filtering past stationary cars clips a car's mirror) and asks under which of five rules the car owner would be compensated. It then changes one fact at a time: the mirror had been pulled out of its normal position; the mirror would have been struck anyway. Each change asks the question again (pp. 35–37). You are choosing the rule that produces the stated outcome on those facts and no other.
The decided-examples shape. You are given three to six short scenarios, each with an outcome. Then a question: which of these rules is consistent with all of the decisions? This is the version worked below, because it makes the method easiest to see.
The options are four or five candidate rules; the Report's sample uses five. One is consistent with every example. The others each fail on at least one — and that is the key structural fact, because it tells you what to do: look for the example that eliminates.
The method
One: tabulate. Scenario, outcome, and the facts that differ. A table beats prose here, and it takes twenty seconds.
Two: find the pair that differs by one fact. Two scenarios with opposite outcomes and one factual difference between them tell you that difference is doing the work. This is the single most productive move available, and it is the one candidates skip.
Three: test each candidate rule against every example. Not against most. A rule that explains four of five is wrong, and it will feel right, because four out of five is a lot of agreement.
Four: prefer the rule that is neither too wide nor too narrow. A rule that explains the examples but would also produce outcomes the examples contradict is too wide. One that explains them by restating their facts is too narrow to be a rule at all.
A worked set
In each of the following, a court decided whether a person was liable to compensate another for loss caused by their statement. A. Dhanvi, a chartered accountant, prepared audited accounts for a company, knowing its bank would rely on them in deciding whether to lend. The accounts were negligently prepared. The bank lent and lost money. Held: liable. B. Ishaan, an accountant, prepared accounts for a company for its internal use. A supplier obtained a copy from a third party, relied on it and lost money. Held: not liable. C. Reva, a surveyor, valued a building for an insurer, knowing the insurer would rely on the valuation. Her valuation was negligent. The insurer relied on it and lost money. Held: liable. D. Meghnad, a surveyor, valued a building for an owner. The owner showed the valuation to a buyer, without Meghnad's knowledge. The buyer relied on it and lost money. Held: not liable. E. Sahil, an engineer, prepared a report for a developer, knowing it would be shown to prospective purchasers to induce purchases. It was negligent. A purchaser relied on it and lost money. Held: liable. Which rule is consistent with all five decisions? 1. A professional is liable for loss caused by a negligent statement to anyone who relies on it. 2. A professional is liable for loss caused by a negligent statement only to the person who engaged them. 3. A professional is liable for loss caused by a negligent statement to a person whose reliance they knew of, or knew of as a class, when making it. 4. A professional is liable for loss caused by a negligent statement where the statement was made for a commercial purpose.
Work it before reading on.
Option 1 fails on B and D. In both, someone relied and the professional was not liable. Too wide.
Option 2 fails on E. Sahil was engaged by the developer; the purchaser recovered. It also fails on A, since the bank did not engage Dhanvi. Too narrow.
Option 4 fails on B and D. Both statements were made for commercial purposes and produced no liability. Wrong feature entirely — this is the option that picks a fact present in all five scenarios and mistakes it for the operative one.
Option 3 holds throughout. A: Dhanvi knew the bank would rely — liable. B: Ishaan knew of no such reliance — not liable. C: Reva knew the insurer would rely — liable. D: Meghnad did not know of the buyer — not liable. E: Sahil knew of the class of prospective purchasers, though not the individual — liable, which is why the rule has to say "or as a class".
Notice how the pairs do the work. A against B: both accountants, both negligent, and the difference is knowledge of reliance. C against D: the same, for surveyors. E is then the test of whether your rule is precise enough — knowledge of a class rather than an individual.
The errors to expect
Choosing a rule that explains most examples. Option 1 explains three of five and feels obviously correct as a statement of fairness.
Picking a feature common to all the examples. Option 4 does this. Everything in the set is commercial, so commerciality cannot be what distinguishes the outcomes. A feature shared by both the liable and the not-liable cases cannot be the operative one — that single observation kills a lot of wrong options.
Stopping at the first consistent option. They are not ordered helpfully. Check all four.
Adding facts. The rule must be derivable from the examples, not from what you think the law is.
How to practise without new material
You do not need a question bank for this. Take any ordinary legal reasoning passage, cover the principle, and read only the facts and the answers. Then work out what the principle must have been, and uncover it to check.
Every passage you have becomes a rule derivation exercise, and doing it improves your ordinary passage work as well, because it forces you to notice which facts the principle is actually keyed to.
The passage pieces on this site all work for it: consumer protection, contract, tort, family, labour.
Whether to spend time on this now
If you are sitting CLAT 2027: the pattern is frozen, so not as a separate topic. The underlying skill — noticing which fact a principle turns on — pays immediately in ordinary passages, and the exercise above costs nothing extra.
If you are sitting CLAT 2028: still not as a separate topic, because nothing is confirmed. Build the general skill, which transfers either way. The Class 11 plan covers what actually deserves the hours.
For a current measurement, the free Diagnostic Test times a full Legal Reasoning section and shows you where the minutes went.