You can mix encouraging and positive thoughts while giving evaluation which is one of the best ways to create a keen desire to incorporate necessary changes. Make sure that you should give complete chance to all employees to defend any wrong evaluation. There are several chances that are responsible for their failure and you have to put more stress on understanding those issues. Try to know if employees need any necessary material or tools for the completion of job. If yes, go ahead and try to provide everything that they need. It is very essential to end the evaluation with positive note and also offer all the employees to give their feedback. So, when employees recognize the fact that their feedback counts, it increases employee satisfaction and then you will experience the positive results from employee evaluations.