Thi course gives an overview of the assessment process of mathematics skills in children. Chapter 1 discusses formal and informal screening methods which assess a core deficit in processing numerosities. Chapter 2 gives an overview of the formal and informal assessment of basic number skills. It discusses some of the commonly used published assessments and provides a table summarising the skills they assess. Chapter 3 looks at the need to develop flexible thinking in mathematics and suggests ways of assessing cognitive thinking style using informal approaches.