Answer: The answer is provided below
Step-by-step explanation:
1. Underfinancing: One main reason that cause budget overrun and less than expected benefits is underfinancing. Allocation of an adequate amount of budget to project at the beginning will lead to a budget overrun or failure.
2. Unfeasible Cost Estimates: Estimation of cost is a vital process in a project and another common reason for budget overrun. When the cost is calculated by inexperienced or unqualified personnel, the project is going to face budget overruns.
3. Underestimating the Project Complexity: Big projects are usually at the risk of overrunning its budget as a result of bigger complications that may arise during its execution.
4. Lack of Resource Planning: When one fails to plan the resources that are available effectively, then this would lead to a budget overrun and less benefits. A common mistakes that cause overrun is failure to estimate the resources which would be utilized during the project.