A Harvard Business Review survey conducted with more than 400 global CEOs found that executional excellence was the number one challenge heading a list of 80 issues which included innovation, geopolitical instability and top-line growth. The effect of a 5% shortfall in forecasted revenue would translate to an 18% shortfall in operating profits (based on a FTSE 250 5-year operating margin of 12%). Ambitious or clever strategies are not enough, successful execution depends on asking the difficult questions that challenge you and those around you.