The article aims to present the tradition of the ‘clarity-makers’, i.e. members of the Lvov-Warsaw School, its methodological postulates and scientific style. In the first part, the author presents Kazimierz Twardowski as a teacher and refers to the problem of style clarity and ambiguity. In the second part, the author reconstructs the characteristics of the language and style of the School presented by Maria Rzeuska and confronts it with the recipes for the intelligibility of expressions formulated by Walery Pisarek. In the third part, the author presents the results of the textual analysis carried out to illustrate how the postulates of clarity and justification were reflected in the style of writings of selected LWS representatives. The preliminary results confirm that the representatives’ declared desire to clearly express their thoughts manifests in their texts. The presented results also seem to indicate the need to revise various quantitative observations on the scientific style based on larger samples.