A method for navigating between user interfaces, comprising: at an electronic device with a touch-sensitive display, and one or more sensors to detect intensities of contacts with the touch-sensitive display: displaying, on the touch-sensitive display, a user interface for an application; detecting an edge input that includes detecting a change in a characteristic intensity of a contact proximate to an edge of the touch-sensitive display while the contact is at a location that corresponds to an operation in the application; and, wherein: in response to detecting the edge input: in accordance with a determination that the edge input meets system-gesture criteria, performing an operation that is independent of the application, wherein: the system-gesture criteria include intensity criteria, including a criterion that is met when the edge input includes an increase in intensity of the contact above a first intensity threshold; the system-gesture criteria include a location criterion that is met when the intensity criteria for the contact are met while the contact is within a first region relative to the touch-sensitive display; and in accordance with a determination that the edge input meets application-gesture criteria and does not meet the system-gesture criteria, performing the operation in the application instead of performing the operation that is independent of the application. displaying, on the touch-sensitive display, a user interface for an application; detecting an edge input that includes detecting a change in a characteristic intensity of a contact proximate to an edge of the touch-sensitive display while the contact is at a location that corresponds to an operation in the application; and, wherein: in response to detecting the edge input: in accordance with a determination that the edge input meets system-gesture criteria, performing an operation that is independent of the application, wherein: the system-gesture criteria include intensity criteria, including a criterion that is met when the edge input includes an increase in intensity of the contact above a first intensity threshold; the system-gesture criteria include a location criterion that is met when the intensity criteria for the contact are met while the contact is within a first region relative to the touch-sensitive display; and in accordance with a determination that the edge input meets application-gesture criteria and does not meet the system-gesture criteria, performing the operation in the application instead of performing the operation that is independent of the application. in accordance with a determination that the edge input meets system-gesture criteria, performing an operation that is independent of the application, wherein: the system-gesture criteria include intensity criteria, including a criterion that is met when the edge input includes an increase in intensity of the contact above a first intensity threshold; the system-gesture criteria include a location criterion that is met when the intensity criteria for the contact are met while the contact is within a first region relative to the touch-sensitive display; and the system-gesture criteria include intensity criteria, including a criterion that is met when the edge input includes an increase in intensity of the contact above a first intensity threshold; the system-gesture criteria include a location criterion that is met when the intensity criteria for the contact are met while the contact is within a first region relative to the touch-sensitive display; and in accordance with a determination that the edge input meets application-gesture criteria and does not meet the system-gesture criteria, performing the operation in the application instead of performing the operation that is independent of the application.