A slide rail assembly, comprising: a first rail; a second rail displaceable with respect to the first rail; and a third rail displaceable with respect to the second rail; characterized in that the slide rail assembly further comprises: a first auxiliary structure disposed on the first rail; a first working member movably mounted on the second rail and configured to be in either one of a first state and a second state with respect to the second rail; and a first contact feature disposed on the third rail; wherein when the third rail is at a retracted position with respect to the first rail, the second rail is retracted with respect to the first rail, and the first working member is in the first state; wherein while the third rail is being displaced from the retracted position to a first extended position in a first direction, the first working member in the first state is brought into contact with the first auxiliary structure and is thus switched from the first state to the second state; wherein while the third rail is being displaced from the first extended position to the retracted position in a second direction, which is the opposite direction of the first direction, the first contact feature on the third rail is brought into contact with the first working member in the second state so as to drive and thereby retract the second rail with respect to the first rail in the second direction; the slide rail assembly further comprising a second working member movably mounted on the second rail and a second contact feature disposed on the third rail, wherein the second working member is configured to be in either one of the first state and the second state with respect to the second rail; the second working member is in the first state when the third rail is at the retracted position with respect to the first rail; and while the third rail is being displaced from the retracted position to the first extended position in the first direction, the second contact feature on the third rail is brought into contact with the second working member in the first state to help displace the second rail in the first direction. a first rail; a second rail displaceable with respect to the first rail; and a third rail displaceable with respect to the second rail; characterized in that the slide rail assembly further comprises: a first auxiliary structure disposed on the first rail; a first working member movably mounted on the second rail and configured to be in either one of a first state and a second state with respect to the second rail; and a first contact feature disposed on the third rail; wherein when the third rail is at a retracted position with respect to the first rail, the second rail is retracted with respect to the first rail, and the first working member is in the first state; wherein while the third rail is being displaced from the retracted position to a first extended position in a first direction, the first working member in the first state is brought into contact with the first auxiliary structure and is thus switched from the first state to the second state; wherein while the third rail is being displaced from the first extended position to the retracted position in a second direction, which is the opposite direction of the first direction, the first contact feature on the third rail is brought into contact with the first working member in the second state so as to drive and thereby retract the second rail with respect to the first rail in the second direction; a first auxiliary structure disposed on the first rail; a first working member movably mounted on the second rail and configured to be in either one of a first state and a second state with respect to the second rail; and a first contact feature disposed on the third rail; wherein when the third rail is at a retracted position with respect to the first rail, the second rail is retracted with respect to the first rail, and the first working member is in the first state; wherein while the third rail is being displaced from the retracted position to a first extended position in a first direction, the first working member in the first state is brought into contact with the first auxiliary structure and is thus switched from the first state to the second state; wherein while the third rail is being displaced from the first extended position to the retracted position in a second direction, which is the opposite direction of the first direction, the first contact feature on the third rail is brought into contact with the first working member in the second state so as to drive and thereby retract the second rail with respect to the first rail in the second direction; the slide rail assembly further comprising a second working member movably mounted on the second rail and a second contact feature disposed on the third rail, wherein the second working member is configured to be in either one of the first state and the second state with respect to the second rail; the second working member is in the first state when the third rail is at the retracted position with respect to the first rail; and while the third rail is being displaced from the retracted position to the first extended position in the first direction, the second contact feature on the third rail is brought into contact with the second working member in the first state to help displace the second rail in the first direction.