A permit to work system is a system that ensures work is done efficiently and safely. It is typically used in skilled jobs in high-risk industries.
A permit to work system aids in the management of hazards in jobs with higher levels of risk. Some key components required for an effective permit to work system are discussed here.

Important Characteristics of a Work Permit System.

To understand how a permit to work system works in the workplace, we must first understand what it does and the reason why it's required. Here are some important aspects of a safety and health permit system that you should be aware of.

1. Never Begin Without One
2. Understand How the Permit Works 
3. Keep Everyone Informed
4. Pay Special Attention at Temporary Suspension/Shift Handovers
5. The Workforce Must Have Relevant Skills
6. Work With a “What If” Mindset
7. Stop As Soon As the Situation Changes or Appears Suspicious

To Summarise:

We have outlined some of the key components of a permit to work system that must be in place to ensure its efficiency.
The presence of a permit to work system does not imply that a task is safe or that anyone involved can continue doing it without regard.
To be effective, everyone involved in a permit to work system must understand their assigned roles, have the competence to perform the tasks, follow the guidelines at all times, be cautious, and act immediately when a problem arises - even if it means temporarily ceasing the task at hand.