The fourth step is to detect the fallacies of the argument, which are errors or flaws in the reasoning that can weaken the validity, soundness, or relevance of the argument. Fallacies can be intentional or unintentional and some of the most common types are ad hominem, appeal to authority, appeal to emotion, begging the question, false dilemma, hasty generalization, slippery slope, and straw man. For example, ad hominem involves attacking the person rather than their argument, while appeal to authority involves relying on an unqualified or biased source. Appeal to emotion involves manipulating the feelings of the audience rather than their reason. Begging the question assumes what needs to be proven and false dilemma presents only two options when there are more. Hasty generalization draws a conclusion from insufficient or unrepresentative evidence and slippery slope predicts a chain of events without sufficient justification. Lastly, straw man involves misrepresenting or exaggerating the opponent's position.