The Ministry of Economy, Trade and Industry of Japan has actively involved itself in technology roadmapping in recent years in order to build a broad discussion basis for researchers and business-oriented people in academia, industry and government. This unique attempt is not fully tested in the context whether the “public sector's roadmaps” are viable for promoting innovation and for building tight collaborative relationships between different sectors. However, the authors have been widening the application of roadmapping activities from classical R&D management to new ways of promoting technology convergence, in which the Japanese R&D community is said to be not so accustomed. This paper depicts the governmental agency's objectives, activity details and ways of applications of technology roadmaps and roadmapping. The authors' intention is not only to introduce this kind of governmental activity to the MOT world, but rather to ignite discussions on the usefulness and effectiveness of technology roadmaps and roadmapping in a wide range of knowledge sharing.