Essex County’s Councils Data Mastery tool is designed to support local authorities to understand where they are in terms of their use of data and how they can improve their data maturity and proficiency. The tool was developed as part of the ‘Digital Maturity Strategy’ of the Children's Social Care (CSC) COVID-19 Regional Recovery and Building Back Better Fund in the wake of Covid. It is part of a wider initiative to promote best practice around data in children’s social care, guiding practitioners through a survey to identify their current data maturity as an organisation.