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The advancement of knowledge in the electronic design is strongly influenced by Technology Computer Aided Design–TCAD. Here is an interesting positive feedback, because the computing power helps the designers to perform modelling, simulation, optimisation and design of the new devices with improved performance, which have the capability to increase the computing power. The chapter present the basic aspects and the state-of-the-art of processes and devices modelling completed with the new aspects presented by the author in their last few year’s papers like the results of his researches | 1 SEMICONDUCTOR PROCESSES AND DEVICES MODELLING Florin Babarada Faculty of Electronics Telecommunications and Information Technology University Politehnica of Bucharest Romania 1. Introduction The advancement of knowledge in the electronic design is strongly influenced by Technology Computer Aided Design-TCAD. Here is an interesting positive feedback because the computing power helps the designers to perform modelling simulation optimisation and design of the new devices with improved performance which have the capability to increase the computing power. The chapter present the basic aspects and the state-of-the-art of processes and devices modelling completed with the new aspects presented by the author in their last few year s papers like the results of his researches. 2. Models in micro and nanoelectronics Modelling simulation and analysis Due to high costs and long manufacturing cycle the modelling simulation and optimisation or simply TCAD is the foundation of micro nanoelectronics rapidly progress. The analysis involves the separation of the entire in component parts characterization and judgment them and also the examination of the elements of system and the relations between them to understand. Simulation is the imitative representation of the operation of a system or process through the operation of other s or the examination of a problem without experimentation. If the analysis can be precise about the simulation we accept the idea of approximation. Modelling is the production of a representation or simulation of a problem process or device making a description or analogies to help the visualization of the aspects that can t be directly observed. Modelling is a need for analysis simulation and design optimisation. A model for a pure simulation such as that produced by fitting of the curves is usually much simpler than a model for analysis which should reflect the physical aspects in a qualitative manner. An example is the application of Monte Carlo .