As engineers, we have a great deal of black and white in our world. We have been trained to define a problem and come up with a solution. Does a structure have the capacity we need, or not? How do the capacities compare to the imposed loads? We use “engineering judgment” grounded in our knowledge and experience to determine whether a structure is safe; but, even with this information, we are using defined skills. It can be difficult to see that there is also a lot of gray area in engineering. …