The first part of the study is concerned with the role of warrant statements in theoretical discourse; while the second part concerns their role in practical discourse. Also examined are necessity, probability, knowing, seeing and the complex of terms which allow us tointroduce an argumentative structure into discourse.

1. Warrant statements. 2 The Alethic Modalities. 3 Knowing. 4 Perceptual Terms. 5 The Diction of Argument. 6 Variations on a a Four-part Theme. 7 Value Judgements as Warrant Statements. 8 Facts and Values