The objective of this book is to teach readers the most essential modelling techniques and methods, as well as optimization techniques for liquid crystal devices. It does not repeat the basic liquid crystal device physics discussed in other books, it uses device functions as examples and homework problems for illustrating the modelling methodologies. All the modelling methods discussed in the book are self-contained and comprehensive so that readers do not need to rely on other books. A website containing the basic modelling programs is provided with the book so that the readers can have hands-on experience.