This dissertation, "Enhancing the Effectiveness of Counting Blessings on Subjective Well-being: the Effects of Autonomy Support and Implementation Intention" by Suk-har, Mak, 麥淑霞, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: The study investigated whether providing autonomy support and implementation intention would enhance participants' subjective well-being in a counting blessings intervention. One hundred and one senior secondary school students were randomly assigned into four conditions: (1) with both autonomy support and implementation intention; (2) with autonomy support only; (3) with implementation intention only; and (4) without autonomy support and implementation intention (control). They were then instructed to count three blessings daily for two weeks. The results indicated that participants' positive affect was significantly enhanced by counting blessings intervention with autonomy support; while their life satisfaction and positive affect were significantly promoted by the intervention supplemented with implementation intentions. Implications of the findings were discussed. DOI: 10.5353/th_b5156738 Subjects: Well-beingQuality of lifeHappiness