The development of learning practices that enable students to transfer knowledge across contexts, is a dominant topic in Physics Education Research. Assessment is a key activity in the learning process. The purpose of this paper is to illustrate the value of analysing introductory physics assessments using the Semantics dimension of Legitimation Code Theory. We discuss the tools used to analyse the test and exam question papers of two consecutive calculus-based introductory physics modules. An analysis of past question papers over 5 years revealed various weaknesses. The outcomes of an intervention based on critical self-evaluation of question papers, using the same tools, are presented. The results indicate that the intervention increased focus on core concepts and context and supported learning that enables transfer. We argue that the use of semantic gravity to analyse assessments is a useful starting point for change in educational practices in order to support transfer.