The aim of this master thesis work is to create a working model of a Hybrid Electric Vehicle architecture on SIMULINK platform, using SIMSCAPE add-on, which allows to easily deal with multi-domain environments. The architecture selected is a P2 Parallel Hybrid vehicle, and the main idea followed during the thesis work has been to create a model with a high compatibility level with respect to the already known Optimal Layout Tool, previously developed by other colleagues of Politecnico di Torino. In order to run a "gradual complexity" philosophy, a working Battery Electric Vehicle (BEV) model, and a working Conventional Vehicle (CV) model are first designed.