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This database collates information about services from around the world that have been shown to have an impact on child outcomes. So far, approximately 100 have been identified. Twenty-five have already been summarised and included, and there will be a steady flow of additions during the coming weeks.

All the services described here meet these criteria:

  • they demonstrate a clear logic model explaining why they are likely to have a beneficial impact on child outcomes.
  • they have been rigorously evaluated or they are in the process of being evaluated. Services evaluated by experimental designs, in that they compare children randomly allocated either to the service or to a controlled condition, are considered to be more reliable than those evaluated by other methods.


Drawing on the best practice of children's services agencies from around the world is a vital part of improving clinical practice. Designing, implementing and evaluating new services is also at the heart of the Common Language project.

For more information about using the database please click here