In 1996, ninety-eight men and women successfully reached the summit of Mount Everest. Unfortunately, fifteen climbers lost their lives. On May 10 of that year, a series of mishaps mixed with a powerful storm to create one of the deadliest days in the mountain’s history. The story of the two teams, led by Rob Hall and Scott Fischer, has become famous due to the blockbuster movie Everest and several books written by the survivors.

Why did some climbers make it to the top and back to basecamp that day, while others lost their lives? John Krakauer, one of the survivors and author of Into Thin Air wrote the following:

“Truth be told, climbing Everest has always been an extraordinary dangerous undertaking and doubtless always will be…the strongest guides in the world are sometimes powerless to save even their own lives. Four of my teammates died not so much because Rob Hall’s systems were faulty-indeed, nobody’s were better-but because on Everest it is the nature of systems to break down with a vengeance.”

Krakauer’s remarks highlight the point that when it comes to Everest type endeavors, it is not only training and preparation that matter – it is also luck. Therefore, we must take the time to reflect on the sources of our successes and failures to better understand our own strengths and weaknesses. By doing so we avoid two pitfalls that can affect later performance: committing fundamental attribution error and developing an overconfidence bias. Both of these pitfalls can leave us blinded and we won’t focus on areas where we need to improve, or we miss out on chance opportunities, or worse, we hitch our personal value to our professional progression (or lack thereof).