Quick answer
Project success rates: only a minority of projects fully hit scope/time/budget targets — the Standish-style numbers put outright success near a third, challenged near half.
The classic numbers
Standish CHAOS-style findings: ~1/3 of projects succeed fully, ~half are challenged, ~1/5 fail — patterns stable over decades.
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By method
Agile projects report higher success rates than waterfall in the same data series — small batches win.
What correlates
Executive sponsorship, clear scope, user involvement and small projects predict success — size is the enemy.
Real-world caveat
Success definitions vary — ‘on time/budget’ is a narrow lens; benefits realization matters more.
Bottom line
Project success rates: only a minority of projects fully hit scope/time/budget targets — the Standish-style numbers put outright success near a third, challenged near half.
FAQ
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