[en] The key issues for a Light Ion Beam Inertial Confinement Fusion (LIB ICF) system are analyzed, based on the conceptual design of a reactor ROKKO 1. Research and development have been conducted systematically, with the cooperation of the laser fusion group in computer simulation, diagnostics and pellet fabrication, and also with the cooperation of industry. The topics of interest are (1) development of pulse power technology, (2) development of diagnostics for high power beam/target experiments, (3) beam generation and concentration of the energy in time and space, (4) beam transport through the laser guided plasma channel, (5) investigation of the beam-target coupling physics and the scaling of ablation pressure with power density and (6) implosion simulation and pellet design. Applications of the focused relativistic electron beam (REB) and the super fast Z-discharge to ICF are also being pursued, looking at the capability of power concentration and efficient conversion from pulsed power energy to radiation energy. (author)