This chapter describes the build environment. Additional chapters describe how the build system parse files, creates C files and assembles binary images into PI compliant firmware images. The EDK II build system uses multiple threads during the build process. The maximum number of threads that will be spawned is controlled in the Conf/target.txt file. Typically, this value will be one more than the number of cores that are on the development workstation. Increasing the number beyond the N+1 value will not offer any performance benefit.