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Abstract
This study aims to determine the effectiveness of gratitude exercise using three good things techniques on happiness at work enhancement. Participants of this study were 15 employees aged 21-28 years divided into two groups: eight participants in the experimental group and seven participants in the control group. The design was a randomized two-group pretest-posttest. Collecting data used to happiness at work scale with Likert model prepared by the researcher. Data analysis methods used by using Mann Whitney U technique for differences of the gain score in the experimental group and control group data score. The result of gain score analysis showed t value = 8.500 and p-value of 0.021 (p