<p> In recent times, the design of three-dimensional (3D) complex shape architectures has become much easier since the advent of 3D-CAD or BIM software. However, the roles of designers, contractors or sub-contractors have become uncertain. For example, in the construction of an architectural project, it is necessary for the associated sub-contractors to possess the prerequisite knowledge of the design processes to avoid discordance of roles or prevent irrelevant design alterations. Additionally, in the application of 3D modeling for designs, the method of transferring design information from designers to contractors is difficult.</p><p> This research elucidates the construction process of formworks of different 3D complex shape reinforced concrete RC architectures. In particular, this research focused on transferring design information from designers to contractors or sub-contractors. Further, the research analyzed the different options involved in the transfer and clarifies the advantages or disadvantages of each option. The results are outlined below.</p><p> First, from the investigation of two architectural magazines, "Shinkenchiku" and "Kenchiku–Gijutsu" from January 20