An introduction to the style and presentation of scientific reports with computing or mathematical content, this text deals with topics such as article design, writing style, illustrations, algorithms, and the scientific process. The focus is on writing for the mathematical sciences, and the text aims to show how to design an article. It gives practical guidelines for writing style, explains punctuation, gives tips for presentation of mathematics, and guides on the presentation of algorithms, hypothesis and experiments. Seminar presentation, a section on spelling conventions, and a detailed bibliography complete the guide.