Do you know of any reliable statistics on the successrate of (aero)space project development?
How many projects suffer major delay and/or significant over budgets? How many projects get cancelled completly during development?
I'm mainly interested in official projects at the taxpayers expense, I'm not so much interested in private studies of companies or universities.
I guess that excludes also very early projects in Pre-Phase A (NASA)/ Phase 0 (ESA), since investments up to this point are quite small.
(For clarification: I'm working on a thesis about preliminary design methods and some numbers would come in handy to support my point that an approvement of conventional tools and methods would affect the successrate of big aerospace projects)