Arguing Like a Scientist

By the end of this lesson, you will be able to build and share a scientific argument respectfully, using evidence instead of opinion.

Scientific argumentation is a friendly, organized discussion where people compare explanations for something they observed and decide which one the evidence supports best. It is not a fight, and nobody is trying to win by talking louder. The goal is to figure out what is most likely true. To do that, you need empirical evidence, which is information gathered through observation or measurement rather than guessing or remembering what someone told you.

Imagine your class notices that the grass on one side of the school football field is thin and brown while the other side is thick and green. One student claims the brown side gets too much shade from the stadium. Another claims the sprinkler on that side is broken. Both ideas sound reasonable, so the class collects data: light readings at noon, soil moisture samples, and photos taken over two weeks. The soil on the brown side turns out to be much drier, even though both sides get about the same sunlight. That measurement is evidence, and it supports the broken sprinkler explanation.

A strong argument has three parts working together. You state your claim, which is your answer to the question. You give your evidence, the data you actually collected. Then you give reasoning, the sentence that explains how your evidence connects to your claim, such as, "Dry soil means the grass could not absorb enough water to stay green."

Being respectful matters just as much. Listen all the way through, ask questions like "What data supports that?" instead of saying "You're wrong," and be willing to change your mind when better evidence appears. Changing your mind because of evidence is a sign of good science, not weakness.

Try it: If the shade readings had been very different on the two sides, what new evidence would you want before deciding which explanation is stronger?