(i) Vestibule training is training of employees in an environment similar to actual work environment artificially created for training purpose.
(ii) This type of training is given to avoid any damage or loss to machinery in the actual place by trainees and avoid disturb the normal work flow in the actual work place.
(iii) It is given to Drivers, Pilots, Space Scientists, etc.

(i) On the job training is refers to the training which is given to the employee at the work place by his immediate supervisor.
(ii) In an other words, the employee learns the job in the actual work environment.
(Iii) It is based on the principle of "Learning by doing and learning while Earning".
(iv) On the job training is suitable for imparting skills that can be learnt in a relatively shorter period of time

Training is one of the planned activities to transfer or modify knowledge, skill and attitude. Every training programme must address certain vital issues listed below.
(i)  Whom to train? : 
Training department has to determine the candidates for whom the training should be imparted.
(ii)  Who is the trainee? : 
A person who is learning and practicing the skills of particular job is called trainee.
(iii)  Who are trainers? :
Trainer is a person who teaches skills to employee and prepare them for a job activity.
(iv)  What method will be used for training?:
Training segment should decide the appropriate method of training among the various methods of training available.
(v)  What should be level the training? : 
Training department should decide the level of training to be imparted to the employees.
(vi) Where to conduct the training programme?:
The venue of training and duration of training should be fixed based on the  availability of note other related factors.

Trainer:
(i)  Trainer is a person who teaches skills to employce and prepare them or a job activity.
(ii) The trainer is otherwise called Instructor,Coach, Teacher,  Mentor, Counsellor, Guide, Guru, Handler, Tutor and Educator etc.
Trainee :
(i)   A person who is learning and practising the skills of particular job is called trainee.
(ii)  Trainees should be selected on the basis of self interest and recommendation by the supervisor or by the human resource department itself.