Final answer:
Karl Marx's important consideration regarding societal change was the conflict between different social classes, specifically the bourgeoisie and the proletariat, which he saw as the primary means of change leading to a classless society and eventually communism.
Step-by-step explanation:
Karl Marx, a seminal social thinker, believed that societal change is driven by conflict, particularly the struggle between the bourgeoisie, the owners of the means of production, and the proletariat, the working class. Within Marx's framework of base and superstructure, the economic base of a society underpins the culture and social institutions or the superstructure. Marx theorized that social classes, especially in the era of capitalism and industrialization, were conflicted, leading to inevitable societal transformations. Marx predicted that this would culminate in a revolution, overthrowing the capitalist system, leading to a classless society and the establishment of communism.
Marx rejected Auguste Comte's positivism, focusing instead on the materialist conception of history, where changes in material conditions primarily drive social changes. His views were jointly published with Friedrich Engels in The Communist Manifesto in 1848, advocating for the overthrow of capitalist societies and predicting a transition from capitalism to socialism and then to communism as the only equitable social system.