Working with data: both an opportunity and challenge for school leaders

The article analyses the concept of data, presents various purposes of working with data in schools and deals with the readiness of people at school to work with data. In the final part the article summarizes selected results of a pilot survey carried out in Czech schools and abroad, focused on finding out how and with what data schools work, which attitudes school leaders adopt towards this activity, how those respondents evaluate their own readiness for work with data and which needs they express in this respect.