Discovery infrastructure

National resource discovery infrastructure

This is jointly provided by NICE and HEE, and comprises:

  • HDAS (Healthcare Databases Advanced Search) built, maintained, and paid for by NICE.  APIs search the bibliographic databases included in the National Core Content Collection.
  • A national Link Resolver, supplied by Wolters Kluwer, provides links to purchased full-text journals licensed for use nationally, regionally, or locally.
  • These links are available within HDAS, native interfaces of purchased databases and Journals A-Z.  A Knowledge Base is available.
  • The Link Resolver contract is managed by NICE.  It is mostly funded by HEE.
  • The NHS OpenAthens authentication system is supplied by JISC. It is managed and funded by NICE.

See the NHS OpenAthens eligibility criteria, the self-registration page, and the OpenAthens and the National Link Resolver page for more information.

Trouble-shooting and support
  • Problems with HDAS, the Link Resolver, NHS OpenAthens, NICE Evidence and access to national core content resources should be reported to the NICE helpdesk via or 0845 003 7744.
  • NICE maintains an NICE Evidence Services Update Page with information about known problems and fix times.
  • Subscribe to a quarterly update to keep up to date with news about these and other NICE products.
  • Training and support materials are available for LKS staff and OA and Link Resolver administrators.


[Page last updated: 6 July 2020]