This article addresses writing in higher education with the primary aim of conceptualizing writing as a mediational tool. The conceptual framework consists of three concepts: "learning trajectories," "mediation," and "recontextualization." The article describes how writing can work as a mediational tool and suggests possible implications for higher education. An empirical study from the context of initial teacher education in Norway is used for the purpose of illustration. Writing activities can mediate learning in important ways. However, design elements that make students explore, contrast, and compare different meaning potentials and position themselves within disciplinary or professional discourse are crucial when considering the potential of writing as a mediational tool in higher education.