Answering certain questions after research

Explain why estimations to complete a task have a lot of safety embedded in it.
Explain why even though tasks have a lot of safety, they still are not completed early or on time (Hint:Parkinson’s Law, Student Syndrome, etc.).
Explain the multi-project environment.What type of problems does the project manager encounter?How about resource managers?

These are the questions related to The Theory of Constraints,

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Questions
Question 1
Estimations to complete a given task have a lot of safety elements that are embedded in it. These estimations are faced by many risks and uncertainties. If these risks are not controlled, there is a great likelihood that the project or activity cannot be completed within the given timeframe that had been projected.

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