The chapter is devoted to the energy efficiency analysis as a prerequisite for sustainable use of energy. In this regard, the current study is focused on the application of soft systems methodology (SSM) and its role as a problem structuring approach to analyze the energy efficiency initiatives. For this purpose, four research works were addressed. The mentioned researches employed a combination of multiple-criteria decision analysis (MCDA) and (SSM) to assess the energy efficiency initiatives. The obtained results included the role of key players in rich pictures with a potential interest in a system for energy efficiency initiatives evaluations, the definition of the root, CATWOE components, and a conceptual model. The results of such processes could be applied in the establishment of a sufficiently accurate decision model capable of offering structured support giving rise to a more informed decision in terms of the energy efficiency measures implementation.