SCons offers a robust and feature-rich design for an SC-build tool. With a Build Engine based on the proven design of the Cons utility, it offers increased simplification of the user interface for unsophisticated users with the addition of the "do-the-right-thing" env.Make method, increased flexibility for sophisticated users with the addition of Builder and Scanner objects, a mechanism to allow tool-masters (and users) to share working construction environments, and embeddability to provide reliable dependency management in a variety of environments and interfaces.