More than 15 years after the introduction of a standards-based curriculum reform, the mathematics teachers are positive towards the reform message but have not changed their classroom practice accordingly. To improve the impact of future reforms, it is important to learn from this situation and to better understand the role of the national policy documents. The purpose of this study is therefore to examine how the standards-based reform in mathematics in Sweden was conveyed in the formal written curriculum. The research questions focus on to what extent and how clearly the national policy documents convey the message. The results show that the message is present to a large extent in the policy documents, but that it is vague and formulated with complex wording. The study gives concrete examples and shows in detail in what ways the documents are vague and complex.