Understanding the theory which informs practice is an essential requirement of all qualifications in health and social care.This book first appeared as a two volume handbook linked to the NVQ framework. As the sector has made the move from NVQs to the Qualification Credit Framework, people working in health and social care are now working on a wider variety of qualifications including Certificates and Diplomas. The need for an understanding of the theory which relates to health and social care practice is embedded in these qualifications.This book has been revised in line with contemporary social care practice and the wide range of qualifications now in use. It is an essential read for everyone working in the sector.