"JWST continues to meet its cost commitments, but unreliable contractor performance data may pose a risk to project management. To help manage the project and account for new risks, project officials conducted a cost risk analysis of the prime contract. ... GAO found that while NASA's cost risk analysis substantially met best practices for cost estimating, officials do not plan to periodically update it. ... Further, the project does not have an independent surveillance mechanism, such as the Defense Contract Management Agency, to help ensure data anomalies are corrected by the contractor before being incorporated into larger cost analyses, as GAO recommended in 2012. As a result, the project is relying partially on unreliable information to inform its decision making and overall cost status."
"The JWST is a joint project of NASA, ESA and the Canadian Space Agency. Europe's contribution includes the Ariane 5 launch, along with two of the four state-of-the-art science instruments optimized for infrared observation of the Universe, and support for scientific operations."