A connector assembly comprising: a first connector part configured to house a first set of terminals, the first connector part having a control protrusion; a second connector part configured to house a second set of terminals, the second connector part being configured to engage the first connector part in a fully engaged position in which the first and second sets of terminals (30, 40) are engaged to one another, the second connector part having a lock member and at least one slider rail; and a connector position assurance structure slidably mounted on the second connector part, the connector position assurance structure being movable from a first position to a second position only when the second connector part is in the fully engaged position to thereby inhibit uncoupling of the first and second connector parts (12, 14); wherein the connector position assurance structure has a locking finger and a slider that is fixedly coupled to the locking finger, the locking finger having a locking tab and an anti-deflection tab, the locking tab being configured to abut a first side of the lock member on the second connector part when the connector position assurance structure is in the first position, the locking tab being configured to abut a second, opposite side of the lock member on the second connector part when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position, the control protrusion contacting the locking tab when the second connector part is in the fully engaged position and the connector position assurance structure is in the first position to urge the locking tab out of alignment with the lock member so that the connector position assurance structure can be moved to the second position, the anti-deflection tab contacting an anti-deflection protrusion on the second connector part when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position to thereby inhibit disengagement of the locking tab from the lock member when the connector position assurance structure is in the second position, wherein the locking finger is spaced apart from the control protrusion when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position to permit the control protrusion to fully seat against the lock member; wherein the slider engages the slider rail to inhibit deflection of the slider when the connector position assurance structure is in the second position; characterized in that the slider being configured to disengage the slider rail to permit deflection of the slider an amount that permits the lock member to disengage the control protrusion when the connector position assurance structure is in the first position. a first connector part configured to house a first set of terminals, the first connector part having a control protrusion; a second connector part configured to house a second set of terminals, the second connector part being configured to engage the first connector part in a fully engaged position in which the first and second sets of terminals (30, 40) are engaged to one another, the second connector part having a lock member and at least one slider rail; and a connector position assurance structure slidably mounted on the second connector part, the connector position assurance structure being movable from a first position to a second position only when the second connector part is in the fully engaged position to thereby inhibit uncoupling of the first and second connector parts (12, 14); wherein the connector position assurance structure has a locking finger and a slider that is fixedly coupled to the locking finger, the locking finger having a locking tab and an anti-deflection tab, the locking tab being configured to abut a first side of the lock member on the second connector part when the connector position assurance structure is in the first position, the locking tab being configured to abut a second, opposite side of the lock member on the second connector part when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position, the control protrusion contacting the locking tab when the second connector part is in the fully engaged position and the connector position assurance structure is in the first position to urge the locking tab out of alignment with the lock member so that the connector position assurance structure can be moved to the second position, the anti-deflection tab contacting an anti-deflection protrusion on the second connector part when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position to thereby inhibit disengagement of the locking tab from the lock member when the connector position assurance structure is in the second position, wherein the locking finger is spaced apart from the control protrusion when the connector position assurance structure is in the second position and the second connector part is in the fully engaged position to permit the control protrusion to fully seat against the lock member; wherein the slider engages the slider rail to inhibit deflection of the slider when the connector position assurance structure is in the second position; characterized in that the slider being configured to disengage the slider rail to permit deflection of the slider an amount that permits the lock member to disengage the control protrusion when the connector position assurance structure is in the first position.