[en] The 3rd workshop of the NIMS-RIKEN-JAEA Cooperative Research Program 'Quantum Complex Phenomena', entitled 'Leading Edge of Iron-based High-T_c Superconductor Research, -Review and Prospect of the Mechanism and Physical Properties-', was held on November 28, 2009 at Center for Computational Science and e-Systems, Japan Atomic Energy Agency. This workshop is aimed to reveal the mechanism of quantum complex phenomena for the developments of next generation functional materials on the basis of 'Joint Research Agreement for the Pioneering R and D with Quantum Beam Technology' concluded by NIMS, RIKEN and JAEA on December 20, 2006. In accordance with this purpose, eminent researchers in the three institutes, AIST and universities talked and discussed the physical properties, theories, and synthesis of a series of iron-based high-T_c superconductors which have been synthesized since the discovery of the superconductivity in LaFePO and LaFeAsO_1-xF_x by Prof. Hosono's group of Tokyo Institute of Technology, including a future prospect of this research area. This report includes abstracts and materials of the presentations in the workshop. (author)