Agile — the management approach that relies on small, entrepreneurial, close-to-the-customer teams — has a reputation that reflects its rapid adoption in software development. It’s for techies. It’s for hip Silicon Valley startups. It is most definitely not for big, old-line companies that are facing an existential crisis and require a full-scale turnaround. In that situation what you need is a clairvoyant dictator, someone who knows exactly what to do and can bring in the mercenaries to do it.