Review the 2009 Global Coaching Client Study commissioned by the International Coaching Federation.  The survey was conducted independently. What the data showed was:

Business impact:

• 70% improved work performance,
• 61% improved their business management,
• 57% improved time management,
• 51% improved team effectiveness

Personal impact:

• 80% improved  self-confidence,
• 73% improved relationships,
• 72% improved communications skills
• 67% improved work/life balance

You can access the original results here