In accordance with some embodiments, a method is performed at an electronic device with a display, a touch-sensitive surface, and one or more sensors for detecting intensities of contacts on the touch-sensitive surface. The device concurrently displays, on the display: a background user interface; and a first version of a notification associated with a first application, wherein: the first version of the notification has a first size, the first version of the notification includes first content, and the first version of the notification is overlaid on the background user interface. While displaying the first version of the notification associated with the first application overlaid on the background user interface, the device detects a first portion of a first input that includes detecting a first contact at a location on the touch-sensitive surface that corresponds to the first version of the notification. In response to detecting the first portion of the first input: in accordance with a determination that the first portion of the first input meets application-launching criteria, wherein the application launching criteria do not require that a characteristic intensity of the first contact on the touch-sensitive surface meet a preview intensity threshold in order for the application launching criteria to be met, the device initiates a process to launch the first application, wherein launching the first application includes ceasing to display the background user interface and displaying a user interface associated with the first application; and, in accordance with a determination that the first portion of the first input meets notification expansion criteria, wherein the notification-expansion criteria require that the characteristic intensity of the first contact on the touch-sensitive surface meet the preview intensity threshold in order for the notification-expansion criteria to be met, the device displays a second version of the notification, wherein: the second version of the notification has a second size larger than the first size, the second version of the notification includes expanded notification content that is not displayed in the first version of the notification, and the second version of the notification is overlaid on the background user interface.