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OBJECTIVE	This study examined the feasibility of a prototype Web-based acceptance and commitment therapy ( ACT ) program for preventing mental health problems among college students .
METHODS	Undergraduate first-year students ( N = 76 ) participated between May and November 2011 .
METHODS	Participants were randomized to ACT or a waitlist , with assessments conducted at baseline , posttherapy , and 3-week follow-up .
METHODS	Waitlist participants accessed the program after the second assessment .
RESULTS	Program usability/usage data indicated high program acceptability .
RESULTS	Significant improvements were found for ACT knowledge , education values , and depression with ACT relative to waitlist .
RESULTS	Subgroup analyses indicated that ACT decreased depression and anxiety relative to waitlist among students with at least minimal distress .
RESULTS	Within the ACT condition , significant improvements were observed from baseline to 3-week follow-up on all outcome and process measures .
CONCLUSIONS	Results provide preliminary support for the feasibility of a Web-based ACT prevention program .

