A "single-threaded owner" (or "single-threaded leader") is a new role describing a general manager who is 100% focused and 100% accountable to making a company's new initiative succeed. The single threaded owner is given their mandate, which could be anything - invent a new product, launch a new line of business, migrate a company to the cloud - and every day they and their team wake up with one question: "how do I make this initiative succeed?". But in practice, single-threaded owners are given very hard problems to solve. Focus and accountability is a necessary step, but you still have to make your program succeed, from strategy to execution.
A story for leaders of all levels.
Even top executives consistently make this mistake when sending e-mail.