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NHS Infrastructure Maturity Model (NIMM)

The NHS Infrastructure Maturity Model (NIMM) is a maturity assessment framework. It assists NHS IT Organisations to:

  • carry out an objective self-assessment of the current IT infrastructure to assess their current 'point in time' maturity of specific infrastructure capabilities
  • identify infrastructure maturity improvement projects

The NIMM framework helps with this process in a number of ways, with the two main tools being:

  • Capability Assessment documents – these contain Key Performance Indicators that each capability is assessed against, resulting in a 'point in time' maturity score
  • Key Capabilities Self-Assessment spread sheet – this dashboard spread sheet records the scores from the CAs and gives an overview of assessment progress

The NIMM User Guidance, the Capability Assessment documents and other tools and information associated with NIMM can be found by following the links to NIMM on the PSPG portal (N3 connection required).

The NIMM Framework aims provide a consistent framework for trusts to measure their own capabilities in specific areas and to subsequently identify and prioritise activity. The decision was taken to publish the NIMM as soon as the model was complete; content creation for the framework is still on-going.

This approach enables trusts to create their own local assessments, aligned with NIMM, to support their local IT maturity assessment efforts. Where such content is forwarded to the DHID Technology Office, it will be merged into centrally provided capabilities. This approach ensures that KPIs and metrics reflect achievable maturity levels within the NHS.

If you have NIMM questions or feedback, local capability assessment documents or suggestions, please email