Hello,
Generally, during performance appraisal, the training & development needs of the employees are identified by his/her superior/Head of the department on the basis of ratings and comments given to skills/knowlege part (We have generally devided performance appraisal in 3 parts; Targets, JD and Skills). These needs are the base to enhance the knowledge and skills of the employees for performing their jobs in a better way.
Training need identification is first step of Training & Development process. Afterwards, Half yearly/yearly training & development activities are planned and then, training programmes are imparted on the basis of T & D plan.
After making efforts for T & D activities, at the end of the year, once again the skills of the employees are assessed and rated. rating would justify the training & development efforts. (However there are many methods to evaluate effectiveness of the T & D)
I hope above information would help you to answer your query to some extent.
Regards,
Vishal