This presentation will discuss the neccessity and significance of setting up an assessment system for an ER programme for young learners. Although the aim of extensive reading is to read for pleasure, it is important for teachers to know the reading level of the students at different stages of the ER programme in order to assess students' progress and to reflect on the programme itself. Some tools and methods for diagnostic testing, periodic assessment and evaluation will be presented. The advantages and limitations of different assessment tools will also be discussed.