Sunit,
I am not a case study person and consider most of them a waste of time. Especially if one knows how to lead a workforce to become highly motivated, highly committed, and fully engaged Superstars who love to come to work and are at least 300% more productive than if poorly engaged. If one does not know the specific actions to take, case studies probably won't be of much value.
That said, I can tell you that in taking over a 1300 person unionized group described by my new boss as "customers hate this group so either get rid of it or fix it", I was able to improve per person productivity by over 300% in about 3 years. We stopped measuring at that point, but did keep improving. I led my subordinate managers in how to treat employees through group meetings to address employee complaints, suggestions, and questions. That leadership combined with coaching subordinate managers in how to address those issues was what turned the group around and created the huge increase in productivity. There were about 4 levels of management between myself and the working level employees.
The effort was one of creating a value-based culture with very high standards. Doing this created very high morale, very high retention, very low stress for everyone including bosses, very low absentee rates, very high innovation and creativity, very high customer satisfaction, very low costs, very low error rates, and very low numbers of personal and other problems. This was managerial and employee nirvana.
Coaching is easy so long as one understands the science of people, why they react the way they do to what management does and does not do. This science makes clear what leadership is and what managerial actions are the right ones and which actions are the wrong ones. More senior managers/executives need to know the science while juniors ones can get away with just knowing the right actions.
Best regards, Ben
Leadership Skills for Managers and Executives.