Managing sustainability work is a process of building internal capacity. Throughout the process, sustainability work is done by different people within the organization. Over time, sustainability is integrated with key business planning processes for an organization. Having a structured process for improving sustainability performance is key to increasing buy-in from management and employees, accountability, and continuous improvement. As organizations iterate the process, they mature from being reactive, to tactical, to strategic in their approach to using sustainability best practices as a strategic business management tool.