(b) Purposes The demonstration program carried out under this part shall demonstrate
(1) whether and on what basis eligible persons choose to reside in safe havens;
(2) the extent to which, after a period of residence in a safe haven, residents are willing to participate in mental health treatment programs, substance abuse treatment, or other treatment programs and to move toward a more traditional form of permanent housing and the availability in the community of such permanent housing and treatment programs;
(3) whether safe havens are cost-effective in comparison with other alternatives for eligible persons; and
(4) the various ways in which safe havens may be used to provide accommodations and low-demand services and referrals for eligible persons.