A touch-sensitive device configured to be worn on a body part of a user, comprising: a substrate with an outside surface and an inside surface opposite from the outside surface; a first contact-sensing component disposed across at least a portion of the outside surface and configured to generate a first signal upon detection of a first contact, wherein the first contact is a touch contact on at least a portion of the first contact-sensing component; characterized by: a second contact-scnsing component disposed across one or more portions of the inside surface and configured to generate a second signal upon detection of a second contact, wherein the second contact is a touch contact of at least a portion of the body part of the user on which the touch-sensitive device is being worn with the second contact-sensing component; and a processor configured to interface with the first contact-sensing component and the second contact-sensing component, and to perform operations comprising: analyzing the first signal and the second signal to determine that a predetermined condition is satisfied, and in response to determining that the predetermined condition is satisfied, initiating a function associated with the predetermined condition, wherein determining that the predetermined condition is satisfied comprises: determining whether the first contact is stationary or moving; and determining whether the second contact is stationary or moving. a substrate with an outside surface and an inside surface opposite from the outside surface; a first contact-sensing component disposed across at least a portion of the outside surface and configured to generate a first signal upon detection of a first contact, wherein the first contact is a touch contact on at least a portion of the first contact-sensing component; characterized by: a second contact-scnsing component disposed across one or more portions of the inside surface and configured to generate a second signal upon detection of a second contact, wherein the second contact is a touch contact of at least a portion of the body part of the user on which the touch-sensitive device is being worn with the second contact-sensing component; and a processor configured to interface with the first contact-sensing component and the second contact-sensing component, and to perform operations comprising: analyzing the first signal and the second signal to determine that a predetermined condition is satisfied, and in response to determining that the predetermined condition is satisfied, initiating a function associated with the predetermined condition, wherein determining that the predetermined condition is satisfied comprises: determining whether the first contact is stationary or moving; and determining whether the second contact is stationary or moving. a second contact-scnsing component disposed across one or more portions of the inside surface and configured to generate a second signal upon detection of a second contact, wherein the second contact is a touch contact of at least a portion of the body part of the user on which the touch-sensitive device is being worn with the second contact-sensing component; and a processor configured to interface with the first contact-sensing component and the second contact-sensing component, and to perform operations comprising: analyzing the first signal and the second signal to determine that a predetermined condition is satisfied, and in response to determining that the predetermined condition is satisfied, initiating a function associated with the predetermined condition, wherein determining that the predetermined condition is satisfied comprises: determining whether the first contact is stationary or moving; and determining whether the second contact is stationary or moving. analyzing the first signal and the second signal to determine that a predetermined condition is satisfied, and in response to determining that the predetermined condition is satisfied, initiating a function associated with the predetermined condition, wherein determining that the predetermined condition is satisfied comprises: determining whether the first contact is stationary or moving; and determining whether the second contact is stationary or moving. determining whether the first contact is stationary or moving; and determining whether the second contact is stationary or moving.