Communism and socialism are economic and political structures that promote equality and seek to eliminate social classes. Sometimes, the two are used interchangeably, though they are quite different. In theory, socialism and communism sound appealing, with everyone doing their share and working together to provide for the greater good. Each utilizes a planned production schedule to ensure the needs of all community members are met. They are utopian economic structures that some countries have tried; however, most have failed or become dictatorships, making reform nearly impossible.