The most populate 18 possibilities your project screw-up for project management:

1. We were not addressing the right problem.

2. We designed the wrong thing.

3. We used the wrong technology.

4. We did not design a good project schedule.

5. We did not haev the right sponsorship. 

6. The team did not know their roles.

7. We did not involve the right people.

8. We did not communicate what we are doing.

9. We did not pay attention to project risks and management issues.

10. The project cost much more than expected.

11. We did not understand and report progress against the plan.

12. We tried to do too much.

13. We did not do enough testing.

14. We were not effective at training the customer.

15. We did not pull the plug on the project when we should have.

16. We tripped at the finish line.

17. The Vendor did not deliver.

18. We had no fallback positin in case of product failed.