Once you can evaluate an argument, you can also make a case stronger by facing what can be said against it. An objection is a reason to doubt an argument; a reply answers it.
Key idea
An objection attacks either a premise (saying it is false) or the link (granting the premises but denying that the conclusion follows). A strong case answers the best objection, not the weakest.
Why it works
Knowing what an objection attacks tells you how much it can do. Knocking out one of several convergent premises weakens a case; knocking out one of two linked premises breaks it. And an objection to the link ("even if that's all true…") can defeat an argument with entirely true premises.
Worked example: What does it attack?
Argument: "The picnic should be at the park. P1: It has covered tables. P2: It is a short walk." Objection: "Even if both are true, the park's fee is more than our budget."
- Does the objection say P1 or P2 is false? No: it says "even if both are true."
- It says something else matters, so the conclusion does not follow.
Answer: It attacks the link.
Worked example: Does the case survive?
Same argument. Objection: "The covered tables were taken down last month."
- This denies P1.
- P1 and P2 are convergent: the short walk is still a separate reason.
- The case is weaker but not gone.
Answer: No, the conclusion keeps some support from P2.
Common mistake
Answering a weak objection and calling the case closed, or thinking that knocking out one premise defeats a conclusion that has other, independent support. Check whether the premises are linked or convergent, and look for the strongest objection.