LaTeX class for B.Sc. and M.Sc. reports at Leiden Institute of Physics (LION). The purpose of this class is twofold: It creates a uniform layout of the student theses from our department. More importantly it contains several fields on the front-page that the user needs to fill that are used in the university administration (name, student number and name of supervisor). Students are free to change the layout of the text but should leave the title page as it is.