This text is aimed at higher education students and reflective mature readers who have an interest in the ideas of pioneering sociologists and social philosophers. The focus of attention is on three nineteenth century theorists, Henri Saint Simon, Auguste Comte and Herbert Spencer. The book builds a clear understanding of important concepts of this era, and devotes chapters to providing a social and historical context to the formative ideas of the theorists regarding their interpretations of history, the direction of social change and their utopian images of the future.