What are the latest employee evaluation trends?

Latest evaluation trend to identify the performance of the employee is Performance Appraisal and Potential Appraisal.Most of the companies are using either of these system for appraisal to their employees. There are other kinds of  appraisal is also existing.The performance of an employee is evaluated on the quarterly,half-yearly or yearly basis depending upon the organisation you are working.There are a)180 degree appraisal where the immediate supervisor evaluates your performance on monthly basis.b)360 degree appraisal where the immediate supervisor,peers,subordinates as well as the top management also get involved in this appraisal.