The Ministry of Justice Data First cross-justice system linking dataset allows users to join up information from data sources across the justice system (courts, prisons, probation) and should be used in conjunction with other datasets shared as part of the Data First Programme. Records relating to individual justice system users can be linked using unique identifiers provided for people involved. This connects people involved in different parts of the criminal justice system or that have interacted with the civil or family courts. This allows for longitudinal analysis and investigation of repeat appearances and interactions with multiple justice services, which will increase understanding around users, their pathways and outcomes. This dataset does not itself contain information about people or their interactions with the justice system, but acts as a lookup to identify where records in other datasets are believed to relate to the same person, using our probabilistic record linkage package, Splink. The person link table contains rows with references to all records in the individual datasets that have been linked to date plus new identifiers, generated in the linking process, which enables these records to be grouped and linked across the datasets. Datasets currently linkable using this dataset are: - Ministry of Justice Data First magistrates’ court defendant - England and Wales - Ministry of Justice Data First Crown Court defendant - England and Wales -Ministry of Justice Data First prisoner custodial journey - England and Wales - Ministry of Justice Data First probation- England and Wales - Ministry of Justice Data First family court - England and Wales - Ministry of Justice Data First civil court - England and Wales It is expected that this table will be extended to include more datasets in future. The case link table links cases between the criminal courts only (for example identifying cases that began in the magistrates' court and have been committed to the Crown Court for trial or sentence, or on appeal). This allows users to follow cases from start to finish and prevent double counting.