British Petroleum Exploration (BPX) is the upstream exploration and production business of The BP Group p.l.c., the world's third-largest integrated oil company. Since 1990 BPX has been engaged in a process of fundamental change that has already yielded significant improvements in performance. For the last two years of that program, I directed a project designed to encourage process review as an accepted management practice. Our brief included capturing and sharing the lessons in process improvement, as learned by various parts of the organization, while also examining and introducing benchmark theory and practice from outside organizations, including other companies, consultancies, and business schools.