All teachers are responsible for assessing the children they teach and the outcomes of any assessment are important for individual learners and the wider school. This book is your one-stop-shop for understanding assessment in schools. It covers formative and summative approaches used across primary and secondary education, supporting a balanced overview with policy examples drawn from the UK, Ireland and wider international contexts. Designed as a pragmatic handbook for new teachers and those training to teach, the book discusses key principles of assessment, before providing guidance on developing and carrying out assessment in the classroom, and looking at how assessment information can be used to benefit your teaching and the children you teach.