Over the last few years, and as governments struggle to attain EFA goals and the MDGs, demand for education has grown tremendously while supply still grows at snail s speed. This has resulted to countries focusing more on quantity at the expense of quality. With this worrying trend, Education Planners are at a loss to ensure quality of education and at the same time ensure access to education. This book, therefore, provides an analysis of Cost Function Analysis in public secondary schools in Kenya with a view to establish their carrying capacity and also the relationship between marginal cost and unit cost. The book further, proposes some recommendations to educational actors on strategies to use to ensure schools operate at an optimal level. This will ensure both internal and external efficiency of the education system.