Do you have any data points on the success rate of agile software development and lean IT projects?

There has been an earlier observation that the success rate of agile software development and lean IT projects are > 50% of the total projects executed. I would like to validate this observation with the statistics about world wide market of software development projects. Attached a link that says the world wide cost of software failure is beyond 2 trillion USD as reported in 2012. Even in conservative matrix, they say 20% of the money spend on IT is going waste. Can you please share your inputs.

http://www.zdnet.com/blog/projectfailures/worldwide-cost-of-it-failure-revisited-3-trillion/15424

Project Execution

Agile Software Development

Software Development

Lean

Lean Software Development

Lean Manufacturing

James O Coplien

Vrije Universiteit Brussel

The problem is defining either "lean" or "agile project." Lean is typically not about projects but about products. And if you read books like "The Toyota Production System" you find that people use the term "lean" for everything from Scrum and TPS-based developments to the ideas from Roos and Womack. They are only casually related, and most people who are doing the latter don't understand the former; most of them don't know the difference. And lean isn't about measuring some final result but about continuous improvement. If you take that perspective, then lean can't fail: only the product fails. Then it becomes a matter on who you want to blame.

So, as the Japanese might say: Mu. You have just asked a non-question.

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