The word ‘diagram’ is not so unfamiliar anymore to those who practice architecture. It is widely used as a design tool for domestic designers as well, including students and architects. The special issue ‘ACTIVITY DIAGRAMS’, which came out before ‘CONCEPTUAL DIAGRAMS’, dealt with few designers’ diagrams in depth. At the point where there exists some concept on what diagrams are, DAMDI now presents ‘CONCEPTUAL IDEA’ as a follow-up. It illustrates through 253 projects, how 83 architects use diagrams to support and explain their projects. In the volume 1, we aranged 3 category [HOUSING | EDUCATION | COMMERCIAL]. And volume 2 [URBAN DESIGN | CULTURAL DESIGN | PUBLIC DESIGN | INSTALLATION].