School leaders' purposeful use of data is essential to ensure that attention is being paid to the progress of every student. In the former, one typically sees bureaucratic "command and control" systems, leaving little discretion to the workers and supervisors at the factory floor or service-delivery level of the organisation. In the latter, the people responsible for actually making the product or delivering the services have much more control of the way resources are used, people are deployed, the work is organised and the way in which the work gets done.