![]() Using inductive reasoning Sherlock concludes that it is likely, but not certain, that the known criminal murdered this victim with the knife and fled the scene. Watson (a doctor) checks and confirms the victim died from the knife wound. Then he checks the finger prints and the blood and runs them through a database, the prints belong to a known criminal and the blood is from two people, both the criminal and the body. Using abductive reasoning he hypothesizes, “perhaps the knife is a murder weapon and was used to murder this person?” As, if that was the case, the observation would make sense (comparing an observation to a known fact or rule to come up with a best guess of what might be the case for the situation to make sense is abduction). Sherlock arrives at a crime scene and finds a body, blood, footprints, and a knife. How to Argue – Philosophical Reasoning: Crash Course Philosophy #2How to Argue – Induction & Abduction: Crash Course Philosophy #3 An Example of Inductive, Deductive, and Abductive Reasoning in the Form of a StoryĬonsider it this way, in the form of a story: If that still doesn’t make sense, try watching the following videos: Reasoning/Argument is all a bit more complex than that, but that is the gist of the three main types of reasoning/argument. And when your premises led to a question / guess, it was abduction. When our premises only pointed toward a likelihood it was induction. Perhaps: This Man is Greek (a hypothesis based on an observation and a known fact we can gather inductive evidence to test this hypothesis, for example by gathering more information about the origin of the man).Īs you can see above, when we reasoned toward a logically certain conclusion, it was deduction. It is “likely” that: Socrates has a beard (given the premises, the conclusion can be assigned a likelihood this argument isn’t very compelling, but to explain that quality of induction here would be a rabbit hole). Here you can see that if a premise is false, deduction can produce false conclusions). It is Certain that: Socrates is Mortal (this is logically certain given the premises if all men are mortal, then Socrates being a man must be mortal. If that doesn’t work for you, let’s try using some classic syllogistic reasoning examples ( NOTE: for the purposes of this page we want to assume all our premises are true we are discussing methods of reasoning, not testing the validity of premises). To put it another way, if one has a group of premises (statements), any conclusion they can draw from those premises that is logically certain is found via deductive reasoning, any conclusion they can draw that is likely given those premises is found via inductive reasoning, and any conclusion that draws not just from what the premises state but from what could also be the case but is not explicitly known for sure (and thus involves guesswork) is found via abduction. ![]() To put it another way, deduction deals with what is the case for sure, induction deals with what is likely the case, and abduction deals with a best guess as to what could be the case based on a limited set of information. In other words, Abduction is forming a hypothesis, induction is like analyzing the data from testing a hypothesis, and deduction would be used in drawing certain logical conclusions from the data gathered. ![]() The core concepts to remember are: deductive reasoning deals with certainty and involves reasoning toward certain conclusions, inductive reasoning deals with probability and involves reasoning toward likely conclusions based on data, and abductive reasoning deals with guesswork, involves reasoning toward possible conclusions based on guesswork (a best guess), it is a type of reasoning that is used in formulating a hypothesis for further testing. These three methods of reasoning, which all other reasoning types essentially fall under or are a mix of, can be a little tricky to illustrate with examples… because each can work a variety of ways (thus any one example tends to be misleading keep that in mind as you read through the examples below). In simple terms, deductive reasoning deals with certainty, inductive reasoning with probability, and abductive reasoning with guesswork. Deductive, inductive, and abductive reasoning are three basic reasoning types. ![]()
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