摘要：The aim of this quasi-experimental study was to analyze the changes derived from happiness and optimism interventions in 12 groups of employees chosen at random in two Colombian companies. For the happiness intervention, three conditions were applied: Expressing Gratitude, Acts of Kindness and Pencil in the Mouth. In the case of optimism, three other conditions were used: Breaking the Routine, Reformulating Goals and Resignifying Failure. In addition, an-swers from a control group, a placebo group and another group on a waiting list were included. 93 people completed the questionnaires at both Time 1 (before the intervention) and Time 2 (after the intervention). Testing of related samples was performed to verify the changes according to each condition. The results show that the condition of kindness alone and combined with the reformulation of goals tended to have more positive effects on happiness levels. There were differences in the effectiveness associated with gender and the employees’ previous levels of happiness and optimism. The practical applications of these findings in the work context and their influence on work performance are discussed.
