A comprehensive advanced level examination of the transport theory of nanoscale devices. - Provides advanced level material of electron transport in nanoscale devices from basic principles of quantum mechanics through to advanced theory and various numerical techniques for electron transport - Combines several up-to-date theoretical and numerical approaches in a unified manner, such as Wigner-Boltzmann equation, the recent progress of carrier transport research for nanoscale MOS transistors, and quantum correction approximations. - The authors approach the subject in a logical and systematic way, reflecting their extensive teaching and research backgrounds.