The main idea of "Socialism: Utopian and Scientific" (1880) was distinguishing scientific socialism and utopian socialism. Engels begins by chronicaling the thought of utopian socialists, starting with Saint-Simon. He then proceeds to Fourier and Robert Owen. In chapter two, he summarizes dialectics, and then chronicles the thought from the ancient Greeks to Hegel. Chapter three summarizes dialectics in relation to economic and social struggles, essentially echoing the words of Marx.

This is Engels' first book (since considered a classic account of England's working class in the industrial age), which argues that workers paid a heavy price for the industrial revolution that swept the country. Engels wrote the piece while staying in Manchester from 1842 to 1844, based on th bohis observations and several contemporary reports conducted over the period.