Abstract
People become familiar with almost all the contents of S/T through browsing of digitized world, then will have a feeling on S/T, and sometimes will get the insight on it too. They will co-create "something" by chance, not only in the direction on the so called leading edge" but also in another direction in a holistic environment conscious way with a human-centered view rather than a earth, S/T and economy-centered view. Decision making sequences by people for different subjects are analyzed to extract common features of engineering decisions. Co-creation engineering will focus on understanding of a certain kind of mature creativity by people there and on its implementation as a system to help people for their own adventure to find out values and solutions by themselves for the society. This paper is one of draft plans which will lead to explore a new field by people, namely, co-creation engineering for such ill-structured problems as environment issues, landscape design and maintenance, engineering of complex systems.
