How can I make a comparison clear about what is being compared?
Quick answer
Name the items being compared, then state the shared criterion or reference point. Compare like with like: use the same measure, period, units, and conditions wherever possible. If the draft includes different kinds of information, label them separately rather than implying they are equivalent. A short table or a sentence explaining what the comparison can—and cannot—show helps readers interpret it correctly.
The question, the details, the next step.
A practical checklist
Name the items or options being compared.
State the shared criterion, scope, period, or reference point near the comparison.
Match units, conditions, and definitions across the items.
Label features, outcomes, estimates, and other different categories distinctly.
Add a brief limitation or mark information as unknown when the comparison cannot support a clear conclusion.
A few more useful answers
Can a comparison use different criteria, such as price and speed?
Yes, if you label them as separate criteria and do not imply they produce one overall ranking. State any shared conditions that make each comparison fair.
What if the options cannot be measured on the same basis?
Explain the difference in kind, or compare them separately against a clear reference point. Avoid presenting unlike measures as equivalent.
How can I tell whether a comparison supports a conclusion?
Check whether the evidence matches the conclusion’s scope. A difference on one criterion supports a claim about that criterion, but may not establish which option is better overall.
