This contribution provides an overview of the Data Quality Control System (QC) of the ALICE Inner Tracking System (ITS2). The QC is software application that is used to validate detector performance online and to guarantee efficient data taking. It is capable of synchronous data flow monitoring at different levels and provides information about data integrity, data rate, hit rate, cluster and track distributions, and even the reconstruction performance of the decay of strange particles.The QC is run during online reconstruction, offline reconstruction passes as well as during the reconstruction of Monte Carlo simulations
