Methods, computer systems, computer-storage media, and graphical user interfaces are provided for facilitating application development. In embodiments, input is received from a designer, the input including an indication of a class of applications and one or more preferences for designing a module specification. Thereafter, the module specification is created in association with the class of applications. Input is received from a teacher in association with the module specification. At least a portion of such input indicates how to recognize when a user intends to run an application. An application is generated based on the input provided from the teacher. Such an application can be used by one or more users.