Step 1: Understanding the question.
The question refers to a type of training that takes place in a simulated real-world environment.
Step 2: Analyzing the options.
- Vestibule training: This is a type of training that takes place in a simulated work environment, similar to the real work setting.
- Programmed instruction: This is a self-paced training method, typically through a manual or computer-based system, not necessarily in a real work environment.
- Internship training: Internships are work placements, but they are not necessarily structured training programs with a specific focus on a simulated work environment.
- Case Study: This method involves detailed examination of specific situations and problems, rather than training in a real-world setting.
Step 3: Conclusion.
The correct answer is Vestibule training, as it involves creating a work-like environment for training.
Final Answer:
\[
\boxed{\text{The correct answer is (1) Vestibule training.}}
\]