Abstract: A graphical user interface of a web-based toolkit application for a cloud-based NLU engine is a drag-and-drop toolkit application for building NLU contextual recognition models. Using the graphical user interface, users who do not have expertise in NLU and text interpretation can focus on building customized NLU contextual recognition models to enable human (end-user) interaction with electronics and software applications without requiring expert programming skills or prior in-depth knowledge of NLU. The NLU models provide an intelligent, natural conversational speech and/or text interface for end-users of electronic devices and software applications.