Not all families can find the school of their choice in Hong Kong. Many look much further afield, with the UK, Australia and North America the popular destinations for thousands of students.
There are also new options closer to home, in Thailand and the mainland.
There are many reasons why children go. Places in the top international and English Schools Foundation schools are in short supply, leaving many disappointed parents. The most sought-after Direct Subsidy Scheme and aided schools are even more competitive.
For parents determined that their children should learn in English and have the opportunity to study at university level, going overseas may, in the end, be their only option.
They may make the move for the early secondary years or be among the many thousands whose teenagers fail to get Form Six places in Hong Kong.
Many believe that boarding is best to ensure their children's all-round development, even if this means them leaving their families. Busy working parents who travel a lot may also think children are better off being fully extended in boarding school than having narrower lives in Hong Kong.