Pragma-dialectics, or pragma-dialectical theory, developed by Frans H. van Eemeren and Rob Grootendorst at the University of Amsterdam, is an argumentation theory that is used to analyze and evaluate argumentation in actual practice. Unlike strictly logical approaches (which focus on the study of argument as product), or purely communication approaches (which emphasize argument as a process), pragma-dialectics was developed to study the entirety of an argumentation as a discourse activity. Thus, the pragma-dialectical theory views argumentation as a complex speech act that occurs as part of natural language activities and has specific communicative goals.

Pragma-dialectics posits an ideal model of a critical discussion with defined discussion stages, rules for critical discussion, and analytical operations. These have been applied to various fields of practice.

In pragma-dialectics, argumentation is viewed as a communicative and interactional discourse phenomenon that is to be studied from a normative as well as a descriptive perspective. The dialectical dimension is inspired by normative insights from critical rationalism and formal dialectics, the pragmatic dimension by descriptive insights from speech act theory, Gricean language philosophy and discourse analysis.

To allow for the systematic integration of the pragmatic and dialectical dimensions in the study of argumentation, the pragma-dialectical theory uses four meta-theoretical principles as its point of departure: functionalization, socialization, externalization and dialectification. Functionalization is achieved by treating discourse as a purposive act. Socialization is achieved by extending the speech act perspective to the level of interaction. Externalization is achieved by capturing the propositional and interactional commitments created by the speech acts performed. And dialectification is achieved by regimenting the exchange of speech acts to an ideal model of a critical discussion.

Based on the meta-theoretical principles described above, the pragma-dialectical theory regards argumentation as ideally being part of a critical discussion. The ideal model of a critical discussion treats argumentative discourse as a discussion in which argumentation is directed at the reasonable resolution of a difference of opinion. The ideal model can serve as a heuristic as well as a critical tool: it respectively constitutes an instrument for the argumentation analyst when deciding about the communicative functions of speech acts and provides a standard for argument evaluation.

In this ideal model of a critical discussion, four discussion stages are distinguished that the discussion parties have to go through to resolve their difference of opinion: the confrontation stage, opening stage, argumentation stage and concluding stage. In the confrontation stage, the interlocutors establish that they have a difference of opinion. In the opening stage, they decide to resolve this difference of opinion. The interlocutors determine their points of departure: they agree upon the rules of the discussion and establish which propositions they can use in their argumentation. In the argumentation stage, the protagonist defends his/her standpoint by putting forward arguments to counter the antagonist's objections or doubt. In the concluding stage, the discussion parties evaluate to what extent their initial difference of opinion has been resolved and in whose favor. The model also defines the nature and distribution of the speech acts that play a constructive part in the various stages of the resolution process.

The ideal model stipulates ten rules that apply to an argumentative discussion. Violations of the discussion rules are said to frustrate the reasonable resolution of the difference of opinion and they are therefore considered as fallacies.

The ten rules are: