We’ve talked with hundreds of chief executives about the struggle,observing both successful initiative and ones that run into the sand.In the process,we've indentified four of the most common mistakes.Here we explain some tips to overcome them.Together,they suggest ways for companies to get more from their leadership-development efforts-and ultimately their leaders-as these organizations face challenges runging from the next demanding phase of globalization to disruptive technological change and continued macroeconomic uncertainty.