I had a startup that was focused on fixing project failure through better requirements management. Page four of our slide deck was the fact that approximately 84% of IT projects fail (where "fail" is over budget, late, or failed to meet the requirements). The newest version of the report has actually improved a bit on those numbers (~30% success now) but it's still terrible.

There's quite a decent blog post about it here https://speedandfunction.com/look-25-years-software-projects...