An ad-hoc developed mobile Visual Editor, designed considering the limited size of the device screen, supports the user in the modeling of the behavior of a MicroApp by composing its application logic. In particular, the approach adopted by the MicroApp editor allows the users to manipulate and connect the actions to build their mobile applications. Graphically, an application action available on the mobile device is represented by a rounded square containing the application icon, such as Camera and Mail, and the name of the action, such as Preview and Send, respectively. The input/output parameters are represented by colored bullets. In particular, as shown in Figure 1, the input parameters are depicted in the higher part of the square, whereas the output parameters are shown on the bottom.