Cost Management

Correct Answer: 1.25

The Cost Performance Index (CPI) is a measure of the financial effectiveness and efficiency of a project. It is calculated by dividing the earned value (EV) by the actual cost (AC). In this scenario, the team has completed $50,000 worth of work, which is the earned value (EV). The team has spent actual cost (AC) of $40,000 to date. So, the CPI would be EV/AC = $50,000/$40,000 = 1.25. This indicates for every $1 of actual expenditure, $1.25 worth of work is accomplished which is an efficient use of the budgeted resources. The answers 0.80, 0.90, and 1.00 are incorrect because they would imply different earned values or actual costs that we do not have in this statement.

Correct Answer: Cost aggregation involves rolling up individual cost estimates into higher-level categories, such as work packages, control accounts, and the project as a whole.

Cost aggregation refers to the process of summarizing or rolling up individual cost estimates into higher, broader categories such as work packages, control accounts, and the whole project. This is done to provide a summary view of the cost and to improve project cost management, which makes the first answer correct. The second answer incorrectly describes cost aggregation as a breakdown process, which is contrary to the actual definition. The third answer mistakenly suggests that cost aggregation is only necessary for small projects, which is not true as it is beneficial for projects of all sizes. The fourth answer inaccurately describes cost aggregation as a process of identifying variances and corrective actions, which is more accurately a component of cost control, not aggregation.

Correct Answer: A cost control account is a higher level WBS element used for cost reporting, while a work package is the lowest level WBS element where work is performed

The correct answer is that a cost control account is a higher level Work Breakdown Structure (WBS) element used for cost reporting, while a work package is the lowest level WBS element where work is performed. This is because a cost control account pools together associated work packages, allowing for cost aggregation and control. It's a reporting level in the project management plan's WBS. On the contrary, a work package is the smallest and most fundamental WBS unit where actual work is performed. Therefore, you cannot equate a cost control account to a work package or vice versa. The other responses are wrong because they either confuse the positions of these two concepts within the WBS hierarchy, inaccurately describe them as types of earned value management or cost estimating techniques, or wrongly attribute the tracking of schedule and cost variances exclusively to either entity.