What do hotels "GSA" and "SGSS" mean?

GSA guest service agent front desk reception

If it's Sheraton

GSA (general employee apprentice) Sheraton Customer Satisfaction Standard (SGSS)

The training of SGSS in Sheraton Hotel, from the general manager to the ordinary staff, is firmly imprinted in my mind, and the most thorough implementation in my work is "SGSS". Maintaining high quality service standards is the "soul" pillar of Sheraton management.