elowerk TestBuilder is the operating software for elowerk test ­systems. TestBuilder is based on the Microsoft .Net Framework and runs on Windows 10, Windows 8, Windows 7, Windows Vista and Windows XP. Test programs can be created by CAD data import. The comfortable graphical user interface allows a straight­forward editing of test programs.  Customized applications can be programmed using a programming interface. TestBuilder can also be extended using plug-in technology. “Plugins” are small program parts which can be called by TestBuilder. This allows customized test methods and operator interfaces to be realized. Any .Net programming language (e.g. BASIC) can be used for implementation. The .Net framework's interop technique allows highly flexible integration of third-party software. Based on this, TestBuilder provides several options for cooperation with third-party software (e.g. integration into National Instruments Teststand).