With funding support from the Hong Kong Early Childhood Development Research Foundation and the assistance of the Public Governance Programme of Lingnan University, the 2015 Children’s Happiness Index survey was conducted following the same methodology as in previous surveys. A total of 9 primary schools and 14 secondary schools (excluding international schools) participated in the survey, involving 1,146 Primary 4 to Secondary 3 students (comprising 428 primary and 718 secondary school students) and 1,509 parents.