The Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) on the NASA Solar Terrestrial Relations Observatory (STEREO) mission is a suite of remote sensing instruments consisting of two white light coronagraphs, an extreme ultraviolet (EUV) imager, and a heliospheric imager. SECCHI will observe coronal mass ejections (CMEs) from their birth at the sun, through the corona to their impact at earth. SECCHI includes a coordinated effort to provide magnetohydrodynamic (MHD) models and visualization tools to interpret the images that will be obtained from two viewpoints and to extrapolate those imagery to in situ and radio emission measurements obtained from STE-REO. The resulting 3- dimensional analysis of CMEs will resolve some of the fundamental questions in solar physics.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.