Figure 1. The Subduction Factory Initiative aims to study fluxes through the subduction zone to address three fundamental science themes: 1) How do forcing functions such as convergence rate and upper plate thickness regulate production of magma and fluid? 2) How does the volatile cycle (H2O and CO2) impact biological, physical and chemical processes from trench to deep mantle? 3) What is the mass balance of chemical species and material, and how does this balance affect continental growth and evolution?