This paper details the methodology used to nowcast the growth rate of the information and communication technology (ICT) sector in the "The growth outlook of the ICT sector" chapter of the OECD Digital Economy Outlook 2024, Volume 1. In an era of rapid digital transformation, innovative data sources for economic measurement are crucial. Internet search data have gained prominence for tracking real-time economic activity. This paper details a nowcasting model that leverages Google Trends data to provide policymakers with timely, up-to-date and comparable data on the economic growth of the ICT sector. Having timely data on ICT sector performance is essential to evaluating the effectiveness of sector-related policies. By addressing data challenges and employing a data-driven approach, this paper advances economic measurement of the digitalisation of the economy and provides insights into ICT sector growth dynamics.