BBBS envisions serving 500,000 children by the year 2004, and school and site-based mentoring activities have the potential to reach 300,000 of these children. Many BBBS agencies have already discovered the power of school-based mentoring and have implemented it in their local areas. The successful efforts of five agencies from throughout the United States with school-based mentoring are described: BBBS of St. Lucie County, Florida; Valley BBBS in Phoenix, Arizona; BBBS of Colorado in Denver; BBBS of Delta County, Michigan; and BBBS of Delaware in Wilmington. Each description contains information on program goals and activities, ways in which mentoring objectives are accomplished, and program successes. The effectiveness of BBBS school-based mentoring programs in other jurisdictions (Alaska, Indiana, and North Carolina) is also noted. 7 photographs