What is critical big data literacy and how can it be implemented?

This paper argues that data literacy today needs to go beyond the mere skills to use data. Instead, it suggests the concept of an extended critical big data literacy that places awareness and critical reflection of big data systems at its centre. The presented research findings give first insights into a wide variety of examples of online resources that foster such literacy. A qualitative multi-methods study with three points in time further investigated the views of citizens about the effects of these tools. Key findings are a positive effect particularly of interactive and accessible data literacy tools with appealing visualisations and constructive advice as well as highly insightful suggestions for future tools.