Identify independent, dependent, moderating and mediating variable (what so applicable) from following illustration

(i) A manager finds that off-the-job training has a great impact on the productivity of the employees. However, he also observes that employees over 60 years of age do not seem to derive much benefit and do not improve with such training.

(ii) A manager is concerned about the job performance of his employees. During his experience, he came to know that job satisfaction is one of the most important factors leads toward high job performance. Furthermore, through article reading he identified that job satisfaction can be enhanced through promotion, rewards and job autonomy.