DAVID ALFARO SIQUEIROS is generally considered to be the founder of the modern Mexican Mural Movement. For more than 40 years, Siqueiros painted monumental revolutionary murals both inside and outside Mexico. He was not only a creator of revolutionary art but also a practitioner of revolutionary doctrine: a soldier in the Mexican Revolution, an anti-fascist volunteer in Spain during the Spanish Civil War, a member of the Mexican Communist Party since 1924, a workers' organizer and leader, and a political activist throughout his life. A passionate muralist of modern realism, schooled in dialectical and historical materialism, Siqueiros sought to organically assimilate into his art and his life the social, political and technological developments of changing society in order to advance the Mexican Mural Movement and better serve the struggle of the oppressed and exploited classes for economic and social justice. In HOW TO PAINT A MURAL Siqueiros recounts his practical and political experience directing his muralist team in San Miguel de Allende, Mexico, detailing virtually every stage of mural painting: the forming of the team, researching the subject and developing the mural composition from the different "spectator" points, the tracing of the mural in an architectonic space, artistic style, developing and constructing improved scaffolding, and making use of new technology -- the airbrush and spray gun, the camera, projector, movie camera and other new tools.