The happiness curriculum was designed and implemented in the Government funded schools in the year 2018. It was developed for children from Nursery to class 8 (Children in the age group from 5 years to 14 years) with an objective to help students ‘towards exploring, experiencing, and expressing happiness’. The curriculum was envisioned as a path-breaking initiative for creating mindful, responsible, and happy individuals. In this model curriculum, the concept of happiness is comprehended as not just a momentary experience but rather as a deeper and sustainable feeling of well-being. The child was expected to comprehend happiness within self, and their relationships with others in the society. This chapter assesses the implementation of happiness curriculum by observation of classroom teaching—learning process, and interview of all stakeholders—children, teachers and parents. Thereby, assessing its effectiveness for happily co-existence within the society and thus collective flourishing.