Most of Burns & McDonnell's engineering positions require "strong analytical and problem-solving skills." So, your interviewer is curious about what your answer to this question, and the example you offer, will say about your level of experience and how it relates to the position. Problem-solving is core to their culture, where they proudly state, "What we do matters. We tackle some of the world's most challenging and complex problems. We never forget about the enormous responsibility- and opportunity-to collaborate with clients so we can improve the global quality of life."