When these five essays by Gottlob Frege were first published in 1962 in the Kleine Vandenhoeck series, Gottlob Frege was still largely unknown. At that time, a detailed justification of Frege's significance for contemporary philosophy was still necessary. Today, his writings have become classics that argue bold theses with exemplary clarity. The volume includes the texts "Function and Concept"; "On Sense and Meaning"; "On Concept and Object"; "What is a Function?"; as well as "On the Scientific Justification of a Concept Script." A detailed preface by the editor and Frege discoverer Günther Patzig and an index facilitate access for the reader.