"Io," one of four satellites of Jupiter, orbits its mother planet in roughly the same plane as Earth orbits the sun. Guidelines for collecting data about Io using a reflecting telescope, 35mm camera, and adapter are presented. A computer program used in studying Io's maximum distance from Jupiter is available. (DH)

Describes good sources of real-time science data available on the World Wide Web for grades 5-12 classrooms. Highlights include preparation and software tools; ways to integrate scientific investigations into classroom instruction; data manipulation, including trend analysis, animation, enhancement, and measurement; and student assessment. (LRW)