Situational Awareness–or SA as human factors specialists like to call it–is a term referring to pilots’ ability to keep the big picture in flight operations. This includes awareness of the aircraft’s location and attitude, its proximity to physical hazards and obstructions, weather and environmental factors, engine and systems status, task priority within the cockpit, and many other factors. Loss of situational awareness is often associated with poor weather, aircraft emergencies and other extreme situations. But more insidiously, loss of situational awareness also occurs in good visual conditions during routine operations. An air carrier Captain describes a case in point: While being vectored on a downwind leg to Runway 01L, Tower asked if we had the field in sight, which we did. At that time we were cleared for a visual approach to Runway 01L and a left turn back to the field was initiated to result in a final of approximately 6 miles. When approximately 60° from the runway heading, Tower reported traffic (a B-757) joining a final for runway 01R. While looking for the traffic the First Officer, who was flying the aircraft, took his eyes off the field and shallowed his bank... When I realized he was not just squaring off his final but was going to overshoot the runway I told him he was going to overshoot and ordered a turn back to our runway. He seemed disoriented and was slow in responding, resulting in a significant overshoot approaching the approach corridor for Runway 01R. A TCAS II-Resolution Advisory resulted with a monitor vertical speed command which was complied with. Tower questioned if we had the traffic in sight which we answered in the affirmative. We corrected back to the 01L centerline and landed with no further incident. In talking to the First Officer after the landing, he indicated that he lost sight of the runway in the left turn. Also that he never actually saw the B-757. Although I indicated that I saw the traffic and pointed it out, the First Officer did not see it, but I assumed he did. I also assumed that he had the runway in sight, so I was unaware that he had lost situational awareness. The lesson to me is to never assume another crew member is seeing the same thing I am and to work to communicate what I am seeing even when weather is good and easy visual approaches are being conducted. We trust this incident taught the First Officer the importance of communicating clearly with other crew when he does not have other traffic and the runway in sight.1. Situational Awareness include the following except: