Reformism is a political tendency advocating the reform of an existing system or institution – often a political or religious establishment – as opposed to its abolition and replacement via revolution.
Within the socialist movement, reformism is the view that gradual changes through existing institutions can eventually lead to fundamental changes in a society's political and economic systems. Reformism as a political tendency and hypothesis of social change grew out of opposition to revolutionary socialism, which contends that revolutionary upheaval is a necessary precondition for the structural changes necessary to transform a capitalist system into a qualitatively different socialist system. Responding to a pejorative conception of reformism as non-transformational, philosopher André Gorz conceived non-reformist reform in 1987 to prioritize human needs over capitalist needs.