Stochastic phenomena play a central role in various scientific disciplines and underpin applications in popular industrial sectors. The purpose of the book is to introduce the reader to advanced concepts in the analysis of stochastic models starting from a detailed, intuitive and yet rigorous presentation of basic concepts. A special emphasis will be placed on problem solving and numerical implementations, with detailed solutions to all of the results and source code in the C programming language provided. The book will also cover recent specialised techniques for popular problems, providing a valuable reference for advanced readers with an active interest in the field.