How can we assess the organisational impact of executive coaching interventions? By asking third parties to share their perceptions, say Erik de Haan & Christiane Niess Billions of dollars are spent every year on executive coaching. As far back as November 2004, Harvard Business Review estimated the global market to be worth around US $1bn. Growth since then has been consistently estimated at 20 per cent a year or more. Larger amounts are spent on internal coaching services and on skills training for leaders and coaches. How do we know that our investment in and...