[How to master speaking skills (and maintain a good delivery)].
Rhetoric, a very popular skill among ancient Greeks and Romans, has become nearly extinct among the modern scientists, mainly due to the abundance of inexpensive textbooks, scientific journals and computers. With this article the author intends to fill the gap in the education of Croatian scientific community by presenting the basics of rhetoric, particularly its application in delivering scientific lectures. This article addresses the classical five-step scheme for preparing a speech (quidditas, compositio, eloquentio, recapitulatio, and actio) and comments on the most frequent errors observed in practice. These are further illustrated in a table listing the most frequent typographic and speech errors and their correct forms.