As human beings, we understand our world through what we see with our eyes, with what we detect with machines, and with reasoning, deduction, and hypotheses that can be tested against reality. DS helps us drive a quantitative understanding of the world around us through reasoning, deduction, and hypotheses that can be tested against reality. It provides a data lens with which we interpret and anticipate the ways the world works. This book aggregates the top capabilities and virtues for successfully leading efforts in DS for the purpose of better understanding and influencing our world.