Book excerpt: This volume records the latest experimental and theoretical results on anisotropies in the cosmic microwave background (CMB). The book begins with a survey article describing the main observational issues, and in which the current COBE DMR whole-sky anisotropy data — now dramatically visible above the noise — are displayed. Results and analyses by the MAX, Python, MSAM, White Dish and South Pole groups, amongst others, are included. The theoretical implications of these results for cosmological scenarios are explored. The workshop also included a discussion of how the interplay between theory and experiment can best be enhanced.