Another important part of thinking critically is checking that the evidence supporting an argument—whether someone else’s or your own—is of the highest possible quality. To do that, simply ask a few questions about the argument as you consider it:
If you have evaluated the evidence used in support of a claim and are still not certain of its quality, it’s best to keep looking for more evidence. Drawing on questionable evidence for an argument has a tendency to backfire. In most cases, a little persistence will help you find better sources.