Welfare has traditionally been provided by 'public', 'voluntary' and 'private' sector organizations. But what do these terms mean within a contemporary welfare landscape where organizations possess characteristics of more than one of these sectors? Is this hybridity eroding the unique qualities of these different sectors?Addressing a key social policy problem, this book analyses modern voluntary organizations through the lens of a new theory of hybrid organizations, which is tested and developed in the context of a range of case studies. This is essential reading for all interested in the future of the third sector, the rise of hybridity in the public sector and the study of organizations.