In order to appropriately monitor and assess the compliance of very large online platforms and of very large online search engines with the obligations laid down by this Regulation, the Digital Services Coordinator of establishment or the Commission may require access to or reporting of specific data, including data related to algorithms. Such a requirement may include, for example, the data necessary to assess the risks and possible harms brought about by the very large online platform’s or the very large online search engine’s systems, data on the accuracy, functioning and testing of algorithmic systems for content moderation, recommender systems or advertising systems, including, where appropriate, training data and algorithms, or data on processes and outputs of content moderation or of internal complaint-handling systems within the meaning of this Regulation. Such data access requests should not include requests to produce specific information about individual recipients of the service for the purpose of determining compliance of such recipients with other applicable Union or national law. Investigations by researchers on the evolution and severity of online systemic risks are particularly important for bridging information asymmetries and establishing a resilient system of risk mitigation, informing providers of online platforms, providers of online search engines, Digital Services Coordinators, other competent authorities, the Commission and the public.