As someone who has studied improv for three years, and read both of Keith Johnstone's books numerous times, I highly recommend reading Johnstone's books specifically, rather than this. It's true that improv is immensely useful in the workplace. However, this article has very little that references Johnstone; it seems to be taking the high level, general understanding of improv as a jumping off point for their own advice. Their chapters to follow do reflect some of the topics Johnstone covers, but again, I highly recommend just reading Impro and/or taking a couple improv classes at your local school if you can. Getting it straight from the source will be incredibly helpful in your work and personal life.