Step 1: Understand the question:
Training methods are of two types: on the job and off the job. The three asked here are apprenticeship, internship and vestibule training.
Step 2: Apprenticeship programmes:
Here the trainee learns a craft or trade under the guidance of an expert or master worker.
Theory in class is joined with practice at work, and the trainee gets a stipend while learning.
It is used for trades like electrician, plumber, welder and similar skilled jobs.
Step 3: Internship training:
Educational institutes tie up with business firms so that their students get practical knowledge.
The students work in the firm for a period while they continue their studies.
It links the learning of the classroom with real working conditions and is often a part of the course.
Step 4: Vestibule training:
A working environment like the real one is set up in a separate room or workshop, using the same type of equipment.
The trainee learns without disturbing the real production and without the fear of costly errors.
It is used for jobs such as typist, machine operator and other clerical and semi-skilled work.
Final Answer:
Apprenticeship trains under a master worker with a stipend, internship gives practical exposure to students, and vestibule training uses a mock workplace away from the real shop floor.