A method, comprising: at an electronic device with a touch-sensitive display, and one or more sensors that are configured to detect intensities of contacts with the touch-sensitive display: displaying, on the touch-sensitive display, a lower-level user interface of a respective application; while displaying the lower-level user interface of the respective application, detecting (7920, 7930) a stationary input that includes detecting a contact at a first location on the touch-sensitive display, wherein the contact remains stationary at the first location, wherein the touch-sensitive display includes a navigation region, and wherein the first location on the touch-sensitive display corresponds to the navigation region; and, the method being characterized in that: in response to detecting the stationary input at the first location on the touch-sensitive display: in accordance with a determination that the stationary input at the first location meets intensity criteria, including a criterion that is met when the input includes an increase in intensity of the contact above a second intensity threshold, ceasing to display the application and displaying an animated transition that includes reducing a size of the application to reveal a higher-level user interface that includes application icons for launching a plurality of different applications on the device including the respective application, wherein the second intensity threshold is above a first intensity threshold; and in accordance with a determination that the stationary input at the first location meets application navigation criteria that are satisfied when the intensity of the contact reaches at least the first intensity threshold and remains below the second intensity threshold, navigating from the lower-level user interface to a different user interface that is above the lower-level user interface in a user interface hierarchy in the respective application while maintaining display of the respective application. at an electronic device with a touch-sensitive display, and one or more sensors that are configured to detect intensities of contacts with the touch-sensitive display: displaying, on the touch-sensitive display, a lower-level user interface of a respective application; while displaying the lower-level user interface of the respective application, detecting (7920, 7930) a stationary input that includes detecting a contact at a first location on the touch-sensitive display, wherein the contact remains stationary at the first location, wherein the touch-sensitive display includes a navigation region, and wherein the first location on the touch-sensitive display corresponds to the navigation region; and, displaying, on the touch-sensitive display, a lower-level user interface of a respective application; while displaying the lower-level user interface of the respective application, detecting (7920, 7930) a stationary input that includes detecting a contact at a first location on the touch-sensitive display, wherein the contact remains stationary at the first location, wherein the touch-sensitive display includes a navigation region, and wherein the first location on the touch-sensitive display corresponds to the navigation region; and, the method being characterized in that: in response to detecting the stationary input at the first location on the touch-sensitive display: in accordance with a determination that the stationary input at the first location meets intensity criteria, including a criterion that is met when the input includes an increase in intensity of the contact above a second intensity threshold, ceasing to display the application and displaying an animated transition that includes reducing a size of the application to reveal a higher-level user interface that includes application icons for launching a plurality of different applications on the device including the respective application, wherein the second intensity threshold is above a first intensity threshold; and in accordance with a determination that the stationary input at the first location meets application navigation criteria that are satisfied when the intensity of the contact reaches at least the first intensity threshold and remains below the second intensity threshold, navigating from the lower-level user interface to a different user interface that is above the lower-level user interface in a user interface hierarchy in the respective application while maintaining display of the respective application. in accordance with a determination that the stationary input at the first location meets intensity criteria, including a criterion that is met when the input includes an increase in intensity of the contact above a second intensity threshold, ceasing to display the application and displaying an animated transition that includes reducing a size of the application to reveal a higher-level user interface that includes application icons for launching a plurality of different applications on the device including the respective application, wherein the second intensity threshold is above a first intensity threshold; and in accordance with a determination that the stationary input at the first location meets application navigation criteria that are satisfied when the intensity of the contact reaches at least the first intensity threshold and remains below the second intensity threshold, navigating from the lower-level user interface to a different user interface that is above the lower-level user interface in a user interface hierarchy in the respective application while maintaining display of the respective application.