Sources and Methods in the Monitor

To get a broad and nuanced picture of (trends and developments in) juvenile crime, it's important to use multiple, independent sources and methods. Therefore, the Juvenile Crime Monitor does not only include registered police and justice statistics, but also self-report data on offending behavior among juveniles. Case file analysis is also conducted. In addition to interpreting quantitative statistics, qualitative findings are used for deeper analysis of developments. Altogether, this provides a nuanced picture of trends and developments in juvenile crime. This provides policymakers and advisors with clearer guidance for developing effective strategies to address juvenile crime than relying on data from singular sources or methods.

Latest update: April 2023

Sources and Methods

A considerable part of juvenile offenders and the offenses they commit remain unknown to police and justice. With the available sources, we can only visualize parts of actual juvenile crime and juvenile offenders. These sources consist of:

  • Non-judicial sources, such as self-report studies among a sample of juveniles, derived from the entire population of juveniles.
  • Judicial sources, such as registered police suspect data or registered data on convicted juveniles from the Public Prosecution Service and the courts.

In addition to providing insight into only part of all of juvenile crime, it must be noted that the perspective on what can be considered juvenile offending behavior varies per source. For instance, self-reported offending behavior mainly provides insight into more common and less serious types of offending, while registered judicial sources predominantly portray insights into more serious types of offending that are visible to the judiciary.

By applying multiple sources (and methods) alongside each other, the limitations of these individual sources are mitigated as much as possible, but not excluded. As such, the JCM describes trends and developments in juvenile crime in the broadest sense possible.

Sources Used in the JCM 2020
Source Indicator Period
Self-Report Juvenile Crime Monitor (MZJ) Self-reported offending 2005, 2010, 2015 and 2020
Basic Enforcement Provision (BVH) Police registrations, incidents, suspects 2010 to 2021
AuraH  HALT juveniles 2005 to 2020
Research and Policy Judicial Documentation Database (OBJD) Convicted offenders and sanctions imposed by the Public Prosecution Service and the courts 2000 to 2020
UNODC Suspects and convicts 2008 to 2019
Judicial Verdicts Qualitative information on cybercrime cases 2010, 2015 and 2019

These sources are discussed in greater detail in the Methodology appendix of MJC 2020.

Contributors to the MJC

  • Scientific Research and Data Centre (WODC)
  • Statistics Netherlands (CBS)
  • National Police (MJC 2020)

Periodic advice is given by an independent, scientific advisory committee during the creation of the JCM.

In-depth Methodological Studies