According to Charles S. Peirce, criticism is a branch of logic.
Critic (sometimes called critical logic) is a section considered along with many forms of argument.
Later, Peirce saw logic as a three-part discipline:
- Speculative grammar – deals with the processes and formation of meaning (respectively, signs-actions and signs-types);
- Critical logic, is the study of the validity and justification of each kind of reasoning. Dedicated to the processes and forms of inferences.
- Methodeutic or speculative rhetoric, the theory of methods.
Logic is usually limited to what Peirce calls criticism, so his conception of this discipline is broader than modern logicians would accept.
