Parents, Personalities and Power: Welsh-medium Schools in South-east Wales is the first volume ever published to investigate in depth the interdependent influences on the phenomenal growth of such schools over the last half century. Derived from a sustained research investigation based in the School of Welsh, Cardiff University (2003–8), the research is set within a constantly evolving linguistic, social and political society. The authors underline the international interest in the sustainable and continuing growth of the Ysgolion Cymraeg, and, as the title suggests, note the various powers that have influenced the shaping of the Welsh-school movement. These reflect the increased interest in the language and identity of Wales and the future challenges these schools face.