This report provides a detailed analysis of the criminal justice process, beginning with an introduction to the process and its stages, including investigation, arrest, prosecution, and sentencing. It identifies key stakeholders such as the police, Crown Prosecution Service (CPS), courts, and various legal entities involved in the process. The report outlines the roles and responsibilities of internal stakeholders like judges, lawyers, and correctional officers, as well as external stakeholders including the media, elected officials, and the public. It further explores different methods for measuring the effectiveness of the criminal justice process, such as crime statistics and performance data, and discusses how these metrics can be used to improve the system. The report also addresses strategies for reducing reoffending, highlighting the roles of police, probation services, and prison services in this effort. Overall, the report offers a comprehensive overview of the criminal justice system, its stakeholders, and its performance measurement.