One of the main goals of university education is to provide the students with the specialized communication patterns shared by experts in a disciplinary field, i.e. specialized text genres and linguistic registers characteristic of these text types. The end-of-degree projects are one of the main tools to assess the acquisition of communication skills by students. This paper describes the process of elaboration of an assessment rubric aimed to be used as a reference for students and instructors involved in the elaboration of end-of-degree projects in Basque. The rubric is based on the interdisciplinary analysis of a textual corpus made up by 101 end-of-degree projects. The main goal of textual analysis is the elaboration of a stylebook aimed to contribute both to the development of academic registers of Basque and to the acquisition of academic communication skills by students together with instructors in scientific and linguistic subjects. The stylebook is an essential tool for the assessment rubric to be useful and effective.