"What do you really need to know about POB and Mustering? For many the answer is obvious but clearly not for all."
POB systems are usually systems that provide a flight management tool that will support logistics. The good ones will include a HR function that contains personnel contact details, qualifications and certificates.
But a POB system alone will not automatically provide a mustering facility. If all you have is a POB system, you will need a mustering system too. It is possible to operate a paper system for a small number or use an old fashioned T card system. They may work.
Imagine that you have 200 people to muster in an emergency. How do you do this quickly? How do you do it accurately?