Peter Killing and Thomas Malnight are professors of business strategy at IMD, the Switzerland-based business school, and Tracey Keys is a consultant. In their book, Must-Win Battles: How to Win Them, Again and Again , published by Wharton School Publishing, they argue that rather than spreading their resources too thin, companies must focus on three to five key challenges — must-win battles (MWBs) that are crucial to achieving their business goals. A well-chosen MWB, the authors say, must make a real difference, be market focused, create excitement, be specific and tangible, and be winnable. This excerpt from the book’s conclusion highlights what can be learned from successful and failed MWB journeys. Five Lessons from Successful MWB Journeys Lesson 1: View a successful MWB kick-off event as only the starting point of your journey. Real success will be determined by what happens back at the office.…