Imagine you're alone in a new country, don't speak the language, nor understand the customs. For some urban students, they experience "culture shock" at college, says Deborah Bial, founder of The Posse Foundation. Over the last 29 years, her New York City-based program has recruited more than 8,000 promising inner-city students to attend the nation's top colleges in groups, or "posses." A four-year-long support program awaits them once there. Bial speaks Sunday, June 17, at Kalamazoo College's commencement.