In this paper we present an extension to the Mobius Framework to deal with Multiple Phased Systems (MPS). MPS are a special class of systems whose operational life can be partitioned in a set of disjoint periods, called phases. Due to their deployment in critical applications, the dependability modeling and analysis of MPS is a task of primary relevance. In the philosophy of an extensible multiformalism multi-solution modeling framework such as Mobius, and due to its wide usage, we have developed an extension for the MPS modeling process. MPS models can be defined using our approach and solved using the simulation supports already available in Mobius.