3 potential problems with an argument

Peter Kreeft suggests these 3 possibilities to watch out for in an argument

1. The terms may be ambiguous: their meaning may not be clear.
2. The premises may be false: you can prove anything from false premises.
3. The logic may not be tight enough: you may not really prove your conclusions.

Citation: I'm not sure where exactly I heard this, but in my journal I simply note that it was Peter Kreeft that I got it from...so go and listen to all of his great talks that are available here.