“helps the reader decide whether the paper is worth reading further. 2. It gives the reader a first idea of the contribution: a new method, chemical, reaction, application, preparation, compound, mechanism, process, algorithm, or system. 3. It provides clues on the type of paper (review paper or introductory paper), its specificity (narrow or broad), its theoretical level, and its nature (simulation or experimental). By the same means, it helps the reader assess the knowledge depth required to benefit from the paper.”