Now in an updated third edition, this invaluable resource takes a practical and accessible approach to identifying and diagnosing many of the factors that contribute to mathematical learning difficulties and dyscalculia. Using a combination of formative and summative approaches, it provides a range of norm-referenced, standardised tests and diagnostic activities, each designed to reveal common error patterns and misconceptions in order to form a basis for intervention. Revised to reflect developments in the understanding of learning difficulties in mathematics, the book gives a diagnostic overview of a range of challenges to mathematical learning, including difficulties in grasping and retaining facts, problems with mathematics vocabulary and maths anxiety. Key features of this book include:Photocopiable tests and activities designed to be presented in a low-stress wayGuidance on the interpretation of data, allowing diagnosis and assessment to become integrated into everyday teachingSample reports, showing the diagnostic tests in practiceDrawing on tried and tested methods, as well as the author's extensive experience and expertise, this book is written in an engaging and user-friendly style. It is a vital resource for anyone who wants to accurately identify the depth and nature of mathematical learning difficulties and dyscalculia.