I was surprised and delighted to be asked to write the final chapter of a book on groups. I certainly thought of myself as a “groups person,” but I was never quite sure that anyone else did. My research image is much more tied to organization theory and strategy. But the reality is that much of my work – from strategic decision making and product development to acquisitions and cross-business synergies – often does deal with groups. Although these more macro-level topics are in the foreground, groups are very often the backdrop.