Coaching is about driving performance and demanding better performance but if we invest time (consciously) in the good things people WILL produce greater effort which leads to better performance. If we only focus on what people do wrong or not as well as we require this begs the question "will the employee continue to pursue better performance if that's all they hear from their manager"?
Here is a brief presentation that may help:

http://play.goldmail.com/bevia7x45hbb
Please contact us if you would like our free book "Quit Managing & Start Coaching" by Tim Hagen.