The document discusses knowledge workers as defined by Peter Drucker in 1959 as those who primarily work with information or develop and use knowledge. It states that to be a knowledge worker requires broad skills, the ability to use a wide range of tools, freely share and distribute information creatively and innovatively while remaining intellectually present and aspiring to new knowledge. It advises that to become a knowledge worker one must keep learning, source information from various places and put it into practice. The key reason given for needing to be a knowledge worker is that the world continues to change rapidly, making knowledge workers more valuable, and not becoming one risks being left behind.