Critical Thinking By Example. The Skeptics' Guide To The Universe - Logical Fallacies. Structure of a Logical Argument Whether we are consciously aware of it or not, our arguments all follow a certain basic structure.
They begin with one or more premises, which are facts that the argument takes for granted as the starting point. Then a principle of logic is applied in order to come to a conclusion. Responsible Thinking: An Approach to Critical Thinking. Ten Common Fallacies Everyone Should Know. When a statement is considered true because it's made by someone who is considered an "authority" on the topic.
Structure: Source A says that "Q" is true. Source A is authoritative. Therefore, "Q" is true. Example: "My doctor says taking St John's Wart everyday will make me less depressed.