Large-scale assessments of educational achievement are predominantly designed to monitor educational achievement within and across education systems over time. At the same time, they are unique data-sets for the research community in many countries and also fulfill the need to meet specific national expectations of educational monitoring. However, their cross-sectional design, international standardization, and time constraints – with regard to both regular study cycles and to the availability of respondents – often present challenges to or limitations on in-depth analytical research or further analysis that is sensitive to country-specific needs. This chapter discusses the strategies that have been deployed in Germany to extend the utilization of LSAs, namely, the extension of survey instruments and administration, documentation, and the addition of further study components.