Near-term to Mid-term R&D. This program is focused on the design of normal conducting and superconducting linear colliders and the development of the required technology. In addition, the program will consider applications of these technologies that may enable other facilities such as Project-X as well as other SLAC facilities. This R&D is aimed at a next generation TeV-scale linear collider but may have application to compact light sources, industrial and medical accelerators.