This paper describes a new concept thrust in advanced ceramics entitled “Frontier Ceramics.” A national project concerning Frontier Ceramics was organized by the Ministry of the Science Technology Agency of Japan. The key objective of the program is to provide an improved understanding of boundaries or interfaces. The approach to be taken is to develop improved means for tailoring ceramic interface through control of structure and composition by use of novel processing techniques and thereby to achieve desired properties. Three main topics in the project relate to the construction of (1) “singular point model”, (2) “ordering interface model,” and (3) “continuous interface model.” Some recent results using bicrystals were reviewed.