James Webb Space Telescope: Project Nearing Completion, but Work to Resolve Challenges Continues, Report to Congressional Committees [open pdf - 4MB]
From the Highlights: "JWST [James Webb Space Telescope], a large, deployable telescope, is one of NASA's most complex projects and top priorities. It is the scientific successor to the Hubble Space Telescope and is intended to help scientists better understand how galaxies and the universe have evolved and study planets in other solar systems. Problems discovered during integration and testing caused multiple delays that led NASA to replan the project in June 2018. Now estimated to cost $9.7 billion, the project's costs have nearly doubled and its launch date has been delayed by over 7 years since its cost and schedule baseline was established in 2009. Conference Report No. 112-284 included a provision for GAO [Government Accountability Office] to assess the project annually and report on its progress. This, GAO's ninth related report, assesses (1) the extent to which technical issues and other challenges affected progress against cost and schedule commitments since 2019 and (2) how the JWST project managed known risks to completing its mission."
Government Accountability Office: http://www.gao.gov/