The Outline of the Style and Constructed Process of the Categories in Product Design

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This study takes notice of a category of products made by typifying and the structure, extracts the basic category of products, investigates the creation in time siries and the process in the change by the case study of "car", "motor bicycle", and "portable telephone".As a result, the change of the category of products decides the process of the formation for adjustment of mutual "power" by a social race and a technological improvement. And in the power for unchanging of the category of products, there is the probrem in social background and the influence by the character of the field of products including the history and the sense of values.In the change in each category of products, there are "derivation", "subdivision", "homogeneousness" and "changeless". The "universalization" can reinforce the typifying, can permeate products as more clear image.The problem to be solved in the future is analysis focus on the detailed information of form. Therefore, it is the subject that the investigation of participation between the parts and the categories, and the estimation of size of the contribution.