In 2003, the high cost of training drove Accenture to study it's impact on the business to find out if the investment was worthwhile. Here are some of the findings reported:

353% return on training investment which generated a company wide net benefit of £1.26 billion.

People who did the most training compared with people who did the least:

• Are 17% more productive
• Perform 20% better than their peer group
• Stay with the company 14% longer

The details are available here