Robin Barrow 
Plato, Utilitarianism and Education (International Library of the Philosophy of Education Volume 3) [EPUB ebook] 

Three lines of argument are central to this book: that Plato’s views as expounded in the Republic indicate that he was a utilitarian; that utilitarianism is the only acceptable ethical theory; that these conclusions have significant repercussions for education. Throughout the book the exposition of utilitarianism and the interpretation of the Republic are closely linked and the author defends Plato against the criticisms of Karl Popper, Bertrand Russell and R H S Crossman.