Adds a second stage object to the tender and lot objects, to describe the second stage of a two-stage procedure. In particular, it adds two fields to describe the limits on the number of candidates to be invited.


If there is an exact limit on the number of candidates, set minimumCandidates and maximumCandidates to the same number.

If maximumCandidates is set, use the selection criteria extension (TBD) to describe how the selection criteria will be used to select candidates to be invited for the second stage.

In the European Union, this extension's fields correspond to eForms BG-709 (Second Stage). See OCDS for the European Union for the correspondences to Tenders Electronic Daily (TED).


  "tender": {
    "lots": [
        "id": "1",
        "secondStage": {
          "minimumCandidates": 5,
          "maximumCandidates": 50,
          "successiveReduction": true,
          "noNegotiationNecessary": false,
          "invitationDate": "2019-08-16T10:30:00Z"


Report issues for this extension in the ocds-extensions repository, putting the extension's name in the issue's title.



  • Add minProperties, minItems and/or minLength properties.

This extension was originally discussed as part of the OCDS for EU profile, in pull requests and in