The Workshop II: Data Past and Present took place on May 17-18th, 2022 at Zuse Institute Berlin. It was organized by Natasa Djurdjevac Conrad (ZIB) and Benjamin Ducke (DAI), as a part of the Thematic Einstein Semester on "Mathematics of Complex Social Systems: Past, Present and Future". This 2-day workshop brought together international scientists from different backgrounds to address a challenging research task of bridging the gap between mathematical models and real-world data from social systems.