Our study is based on the steps for designing a "fossilis" tutorial, allowing the assimilation of the notions of fossil and fossilization. This has basically to do with an interactive software, destined for the students in the field of Sciences of the Earth and the Universe. The general aim of this tool is to facilitate the assimilation and self-evaluation of students’ knowledge concerning the notion of fossil and the course of the fossilization phenomenon in time and in space. The tutorial is a pedagogical platform realized with PHP, "Personal Home Page". It is a set of authoring softwares designed to assist in the creation of web applications that can be deployed on an intranet network of an educational institution. For the tutorial to be designed in an innovative and effective way, there are still phases to be completed. We initially focused on the design and realization of the tutorial to consider, in a second step, a follow-up approach.

Keywords: tutorial, students, fossils, time, space.