This paper reports the findings of a case study in which a curriculum-based positive youth development program (Project P.A.T.H.S.) was implemented by the class teachers in a school. School-related factors which contributed to the success of program implementation were identified in the study. Results showed that factors facilitating the program implementation were closely related to the "5Ps" model (i.e., program, people, process, policy and place). While all the above factors contributed to the success of program implementation, the "people" factor was identified as the most crucial factor. Overall, both the students and program implementers perceived the program to be effective in promoting holistic development in the program participants.