See the full report: ECA report on the development of SIS II (pdf). See also: European Commission: Replies of the Commission to the special report of the European Court of Auditors: "Lessons learned from the
See the full report: ECA report on the development of SIS II (pdf).
See also: European Commission: Replies of the Commission to the special report of the European Court of Auditors: “Lessons learned from the European Commission’s development of the second generation Schengen II Information System (SIS II)” (COM 2014 251, pdf): “The EC can only regret the overall poor recognition by many stakeholders of the decision-making arrangement”.
And: ECA: Schengen IT system ‘six years late and eight times over budget’ (Public Finance International, link)