Abstract
The Enduring Happiness and Continued Self-Enhancement (ENHANCE) program, a 12-week intervention, effectively enhances subjective wellbeing and reduces negative symptoms. The current study tested an abbreviated 7-week version, ENHANCE-II, that may better fit the needs and schedules of some people. In a longitudinal study, participants (n = 51) took part in the self-study program and completed psychological assessments at baseline, posttest, and follow up (5 weeks). Multilevel models were used to analyze the data, with treatment group data from ENHANCE treated as the comparison. Analyses showed improvements in all four outcomes: life satisfaction (statistically significant), positive affect, negative affect, and depression. These effects were about half as strong as those in ENHANCE, but this effect reduction was partially attributable to low adherence. Effects were much stronger among participants who adhered to the program, especially for negative symptoms. Although there were no assessments at later intervals, the study suggests that ENHANCE-II intervention is likely beneficial for participants who need brief programs.