Daniel Bell's 1973 work predicted a transformation of advanced societies from industrial production to information and services. Writing before personal computers or the internet, Bell foresaw a world in which theoretical knowledge would become the central resource, a 'knowledge class' of professionals would gain influence, and manufacturing would decline in economic importance. He examined the rise of service industries, changes in the character of work, and shifts in women's roles that followed from these developments. Bell, a sociologist at Harvard, drew on his earlier works on ideology and American politics to construct a comprehensive theory of social change. The book is more analytical than prophetic, offering a framework for understanding transitions already underway rather than simply predicting the future. Bell's concept of post-industrialism has been criticized and refined but remains influential in social science. Reading the work fifty years later, one is struck by how much Bell got right and how the dynamics he identified have intensified. This is essential background for understanding contemporary debates about technology, work, and the changing nature of the economy.