Holistic dynamics of systems is a new and important in the context of a sys
tem's life cycle. This paper develops the concept of holistic systems. It d
iscusses the modelling of short (fast time) term (dynamics) and long (slow
time) term energy processing (evolution) during the life of the system, and
the incorporation in the holistic model of the system thus the holistic mo
del of the system describes the system evolution as well as its dynamic beh
aviour. System decomposition methods are discussed. The paper presents the
principle of holistic modelling of system decomposed in subsystems and thei
r energy transformation in particular.