What Is the Optimal Way to Deliver a Positive Activity Intervention? The Case of Writing About One’s Best Possible Selves

A 4-week-long experiment examined the effects of a positive activity intervention in which students wrote about their “best possible selves” (BPS) once a week. We manipulated two factors that might affect the success of the happiness-increasing activity—whether the positive activity was administered online versus in-person and whether the participant read a persuasive peer testimonial before completing the activity. Our results indicated that...