International Socialism is a moderate form of Economic Socialism.
It sits half-way between the collectivist views of Communism and the acceptance of Capitalism by the Social-Democratie.
This position translates into stronger support for social programs, state ownership (nationalized industries), unions, and goverment intervention (industry regulation) than one typically sees in social-democracy.
International Socialists, however, stop short of wishing to realize the proletarian revolution.