The design process is the main central concern in design research. It has been considered as a solving problem, as discussed recently by many researchers. Nevertheless, this process could be approached by the theory of complexity. Knowing this latter have different understandings and implications, we can consider the designing as a complex system. However, this approach leads us to think about the different levels of complexity linked to the design product production. In this context, we are often targeting the designer rather than the product itself; or being focused on one aspect to the detriment of another (creativity, problem solving …); or somewhat developing a different process (the process of problem evolution or solution evolution or their coevolution). Regarding process design, it appears too much coherent if we think that it is so complex and almost impossible to pin point and treat everything as unit. Nonetheless, when we go deeply through Edgar Morin writings and his approach of "Complex Thinking" or even "Global Thinking", we are conducted necessary to perceive the design process differently, from global re-thinking point of view. To re-think of it as a complexus. The impact of such an initial approach will be discussed. So, the trends in design research will be reviewed in a first section, We will develop, in a second one, a thinking particular mode of the design process with reference to Edgar Morin's approach.