Abstract: An application may feature a number of application states among which a process shifts during execution of the application. A user or software developer may wish to define one or more transitions to be rendered between a first application state and a second application state, but the application development environment and operating system may provide only a limited number of general-purpose transitions. Instead, a pluggable architecture may be devised to permit a user or software developer to provide a custom transition, and to specify the rendering of the custom transition between application states. The pluggable architecture may therefore enable the user or software developer to define new transitions that are more relevant and complementary of the application states in transit.