Explanation/Reference:
Explanation:
Because schedule performance index (SPI) and cost performance index (CPI) are expressed as ratios, they can be used to show performance for a specific time period or trends over a long-time horizon.
Additionally, there is no need to disclose confidential financial data to convey the project's status to one's customers; they should not have a need to know such information, unless there is a contractual requirement to do so.

Explanation/Reference:
Explanation:
It is important to capture lessons learned, which then can be used on subsequent projects. The more detailed the lessons the better. However, when it comes to personnel lessons learned, the information should be handled in a confidential manner.

Section: Monitoring and Controlling

Section: Mix Questions
Explanation:
Observations are a tool and technique in the collect requirements process. They provide a way to view individuals in their environment and to see how they perform their jobs or tasks and carry out processes.
Another term for this approach is job shadowing and usually is done by an observer viewing the user performing his or her job.

The project manager is responsible for documenting the formal acceptance of the work of the contract. This should be done during Contract Closure when projects are performed under contract or during Close Project if no work was performed under contract. In cases where part of the work was performed under contract and part with in-house staff, formal acceptance should occur in both of these processes.