377 OCTOBER 1994 Using Surname-Based Telephone Survey Methodology in Asian-Ainerican Communities: Practical Issues and Caveats. Toshiaki Sasao. 283 Stressful Life Events and Changes in Substance Use Among a Multiracial/Ethnic Sample of Adolescent Boys. Frank A. Biafora, Jr., George J. Warheit, William A. Vega, and Andres G. Gil. 2% Applying a Stress and Coping Framework to Research on Mutual Help Organizations. Keith Humphreys, John W. Finney, and Rudolf H. Moos . 312 Predictors of Exposure to Traumatic Events and Posttraumatic Stress Sequelae. Sarah E. Ullman and Judith M. Siegel. 328 Brief Report: The Colorado Homeless Mentally Ill: Users and Nonusers of Services. An Empir¬ ical Investigation of “Difficult to Treat” Characteristics. Natalie Sachs-Ericsson, James A. Ciarlo, Dan Tweed, Stephen Dilts, and Edmund Casper. 339 Exploring Adolescents’ Sense of Community and Its Relationship to Loneliness. Grace M. H. Pretty, Lisa Andrewes, and Chris Collett. 346 Citizen Participation in Prevention Activities: A Path Model. Stephen Kauffman and John Poulin 359