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I see that the obstacles arise before project execution is approving the project's plan and alocating the resurces required to complete it.
Obstacles which arise during project execution are mainly due to the rise of unforseen risk or the discovery of inadequate resource selection.
Most Possible Obstacles Before or During Project Execution
Here are some that I have faced in my projects:
BEFORE: conflicts with stakeholders, scope definition
DURING: stakeholders expectation, delay/ non-compliance by implementers - usually missing promised deadlines or quality, act of God/ unforseen risks, poor risk identification and management, cost overrun due to poor scoping