What is the purpose of a qualifier in Toulmin's Argument Model?

In Toulmin's Argument Model, the purpose of a qualifier is to indicate the degree of certainty or strength with which a claim is being made. Qualifiers help to nuance the argument by acknowledging that claims may not always be absolute or universally applicable. For instance, a claim may be stated as "probably," "usually," or "possibly," which informs the audience about the extent of the argument's validity and allows for a more measured approach to the evidence being presented. This is particularly important in persuasive speaking and writing as it adds depth to the argument, conveys caution, and demonstrates an understanding of the complexities inherent in many issues. By employing qualifiers, the speaker helps the audience grasp not just what is being claimed, but how strongly it should be taken as a fact.