Dear Sunil,
To start a Six Sigma program in any process or function or department, first you have to check the trends of process metrics which is related to effectiveness i.e. training effectiveness, training feedback from participants etc. if there is no scope of improvement than you should check the metrics which is related to efficiency of this process i.e. training cost etc.
but as per my suggestion you should start the Six Sigma project only when some pain area lies in any process ( Dont just start any Six Sigma project to show Six Sigma existence !).....most important thing....Process owner's buy in......
Vivek