Version: 2.0.0 | Published: 16 Jun 2026 | Updated: 3 days ago
MoJ Data First Offender Assessment dataset – England & Wales
Dataset
Summary
Citation:
Ministry of Justice, released 08 August 2024, ONS SRS Metadata Catalogue,
dataset, MoJ Data First Offender Assessment dataset – England & Wales,
https://doi.org/10.57906/6hk0-0c42
DOI Name:
Documentation
Description:
The Ministry of Justice Data First Offender Assessment dataset provides data on offender assessments recorded for service users in custody and in the community in England and Wales from 01/01/2011 to 31/12/2023. The data has been extracted from the Offender Assessment System (OASys), used by His Majesty's Prison & Probation Service (HMPPS) to identify the risks and needs of offenders. The dataset covers a variety of different assessment types, including specialised assessments. This allows researchers to identify a wide range of offending-related risks and needs, such as static factors including offending history, and dynamic factors on criminogenic needs including and not limited to accommodation, education, employment, and substance misuse.
Each record in the dataset relates to a single assessment identified by the column oasys_set_pk_hash. The assessments_metadata table contains one record per assessment, and covers metadata such as assessment type and completion date, as well as information about the offender. The contents of the assessments are stored in assessment_details tables, which cover different assessment types including Basic Custody Screening (BCS) and core risks (including basic and full assessments) as well as specialised sub-assessments such as the Spousal Assault Risk Assessments (SARA). To keep the size of tables manageable, certain sections from the core risk assessments such as Risk of Serious Harm (RoSH) have been partitioned into their own tables.
As part of Data First, records have been de-identified and deduplicated, using our probabilistic record linkage package, Splink, so that a unique identifier is assigned to all records believed to relate to the same person.
The Data First cross-justice system linking dataset can be used in combination with this and other Data First datasets to join up administrative records about people from across justice services (courts, prisons and probation) to increase understanding around users' interactions, pathways and outcomes.
Coverage
Spatial
Spatial Coverage:
- England
- Wales
Geographical Levels:
- local authority district
- lsoa11
Temporal
Start Date:
01 January 2011
Latest Data:
31 December 2023
Frequency:
IRREGULAR
Distribution Release Date:
08 August 2024
Provenance
Source:
Administrative
Access and Governance
Usage
Condition of Access:
- Access needs approval
- Restricted access
Condition of Use:
- Special statistical disclosure rules
- Output required for approval
Resource Creator:
Office for National Statistics
Access
Access Service:
- Safe Rooms, SafePods
- Assured Organisational Connectivity – office based
- Assured Organisational Connectivity – remote access
Jurisdictions:
GB-EAW
Data Controller:
Ministry of Justice
Access Level:
Access Level 3
Format and Standards
Languages:
en
Formats:
CSV
Origin
Name:
ONS SRS Metadata Catalogue