How do you introduce reforms in learning assessment? How do you implement an effective assessment? The purpose of this Quick Guide is to help countries to navigate through learning assessment reforms. Chapter 1 presents the main arguments to convince stakeholders to introduce reforms in learning assessments. Chapter 2 focuses on key questions to initiate the policy dialogue. Countries have to make decisions regarding what type of assessment to implement: Should they implement a national, regional or cross-national assessment? Should they develop a brand new national assessment or adapt an already existing one? Chapter 3 offers guidance to make these decisions. Finally, Chapter 4 focuses on considerations that are especially relevant for implementing a national assessment.