These local proceedings contains full and short papers as well as poster descriptions and titles of workshops presented at the 16th International Conference on Informatics in Schools: Situation, Evolution and Perspectives (ISSEP 2023), which was held at the University of Teacher Education (HEP Vaud) in Lausanne, Switzerland, from October 23 to 25, 2023. They complement the proceedings published by Springer (Lecture Notes in Computer Science, vol. 14296, doi:10.1007/978-3-031-44900-0), which contain other full papers also presented at the conference. This preface, and the following Organization section, are largely identical to the one published in the Springer proceedings