BuildOne is a Visual Studio .NET add-in for Software Developers that makes compiling multi-assembly .NET Solutions faster. BuildOne automatically selects the assemblies that need built, reducing the number of assemblies to build and reducing the time a developer waits to begin debugging an application. Developers don't need to switch or modify the Solution's Active Configuration. BuildOne has been validated on XP Home Edition and XP Professional with Visual Studio .NET 2003 installed. BuildOne is compatible with any Windows System that meets the requirements for Visual Studio .NET 2003.