Departments are not meeting government requirements on publishing evaluation plans and findings, and on transparency of models and their outputs. Transparency is critical for the public to understand the evidence behind decisions and how money is being spent. It also allows departments to learn lessons from past projects and from each other. However, ministers have the final say on whether evaluations should be published, and some parts of government are reluctant to Use of evaluation and modelling in government 7 publish their evaluations. It is only recently that HM Treasury has started to ask departments to explain why they do not plan to publish some evaluations. More than one-third of chief analysts say that only sometimes are they able to publish evaluation findings as required. Transparency of the models that departments use to make decisions is also poor: only 9 out of 17 departments have published their list of business-critical models since 2013, and only four have updated this since