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* Signals are multicast - they are sent to all participants in the shared activity (including the sender). They send data and have no return value.
* Signals are multicast - they are sent to all participants in the shared activity (including the sender). They send data and have no return value.
* Method calls are called on a single participant, and they do have a return value.
* Method calls are called on a single participant, and they do have a return value.
<gallery>
Image:EducationalToolkit MVC.png|Standard MVC Model
Image:EducationalToolkit_Model.jpg|Model Component
Image:EducationalToolkit_Controller.jpg|Controller Component
Image:EducationalToolkit_UseCase.png|UseCase diagram
</gallery>