Reengineering is a system-wide change approach that focuses on fundamentally rethinking and redesigning core business processes to achieve dramatic improvements in performance measures like quality, cost, and speed. It involves identifying key processes, setting challenging goals, and designing new processes without constraints of past practices. The organization is then restructured around the new processes, shifting to cross-functional teams and empowered, results-focused roles. Third-wave organizations are flexible, creative, and innovative which allows them to adapt quickly to changes and make themselves obsolete through constant transformation.