Existing engineering strategies have been developed for how to support lean production by considering product quality and safety protection design. Consequently, plant operations become sophisticated. In addition, social requirements such as safety regulations as well as new market demands force plants and/or, their operations to be revamped so as to satisfy demands. There are few methodologies to support life-cycle engineering (LCE) as a whole. Therefore, we have proposed a concept to support LCE and relevant engineering environments at PSE-ESCAPE, Trondheim, in 1997 (Lu et al., 1997). This paper describes our engineering scope for supporting Plant Life-Cycle Engineering with safety-conscious production based on relationships of methodology development and the Engineering Activity Model (EAM) and reports some of our results.