This study focuses on the development and application of computer models for the analysis of various solid materials at the atomic, molecular and macroscopic levels. Many of the papers incorporate environmental effects in the computer models, including space effects such as atomic oxygen, radiation, charged ions, microparticle impacts, temperature and photoexcitation. To better understand the topics covered and their interaction with the various elements presented, the book incorporates a flowchart detailing the contents of the papers and their relationship to the subject areas. The three main sections of the book cover: atomic and molecular processes; electronic structure and processes; and structure and properties.