Types of Argumentation: Deductive and Inductive Methods

Two Ways to Structure Reasoning

When constructing an argumentative exposition, there are two fundamental types of organization we can choose to present our ideas: deductive argumentation and inductive argumentation.

The choice between one or the other will depend on the effect we want to have on the audience and the nature of the arguments we are dealing with.

Both approaches are logical and easy to understand, but they guide the receiver through the reasoning in opposite ways.

One starts from a general assertion and breaks it down into evidence, while the other builds a case from specific evidence to reach a general conclusion.

Deductive Argumentation: From the General to the Particular

The deductive approach is the most direct and traditional. It consists of starting from the most general to arrive at the most particular.

In practice, this means that the exposition begins by clearly and objectively presenting the thesis or main idea to be defended or refuted.

Once the position has been established from the beginning, the rest of the argument is devoted to exposing the different arguments, evidence and reasoning that support it and give it validity.

This structure is very effective when you want to be transparent from the start and have an audience that values clarity and straightforward logic.

The speaker presents his conclusion first and then justifies it.

Inductive Argumentation: From the Particular to the General

Inductive argumentation follows the reverse path: it starts from the particular to build gradually toward the general. In this case, the speaker does not reveal his thesis or main idea at the beginning of the exposition.

Instead, he begins by presenting a series of specific arguments, data, examples or evidence that gradually builds a case.

The thesis is not stated until the end of the argument, at which point it emerges as the only logical and possible solution in light of all the evidence that has been previously presented.