TLCSE is the application of traditional Systems Engineering practices over the entirety of the system life. The system life spans from conceptualization, development, production, implementation, sustainment, and disposal. Appling traditional Systems Engineering practices, we look to decompose the operational needs and system requirements flowing into the design activities.  Today, there is an increasing realization that much of the value that engineering systems generate depends on the degree to which they possess certain life-cycle properties, or -ilities. TLCSE provides a significantly better assessment of the long term cost-effectiveness of a project than alternative economic methods that focus only on “first costs” or on near term operating-related costs.