A control chart is a graphical tool that displays the variation of a process over time and compares it to
predetermined control limits. It can be used to determine whether a sample product is within an acceptable
range by checking if the sample values fall within the upper and lower control limits, which indicate the
expected variation of the process. If the sample values are outside the control limits or show a non-random
pattern, it indicates that the process is out of control and there may be some assignable causes of variation that
need to be investigated and corrected. References = CompTIA Project+ Study Guide: Exam PK0-005, 3rd
Edition, Chapter 8: Quality Management1; CompTIA Project+ Certification Study Guide, 3rd Edition, Chapter
8: Quality Management2

Meeting with the team to emphasize the importance of following change management procedures is the best approach to prevent future unauthorized changes. CompTIA Project+ highlights the importance of adhering to formal change control processes to ensure project alignment and accountability.

Obtaining approval for changes to software is crucial to ensure that the changes do not negatively impact other
functionalities of the software. Approval processes typically involve a review that assesses the potential
impacts of the change, which helps in mitigating risks associated with the change.
References = The answer is based on standard project management practices and the typical use of change
control processes in software development. For detailed information, please refer to the CompTIA Project+
Study Guide and other official CompTIA resources.

Customer notification should be added to the issue log after receiving an escalation from an executive about
the extension of the downtime after the scheduled window. Customer notification is a communication activity
that informs the customers about any issues or changes that may affect their satisfaction or expectations.
Customer notification can help to maintain trust, transparency, and goodwill with the customers and prevent
any negative impacts on their business operations or experience.

The critical path is the sequence of tasks that determines the minimum project duration. It is the longest path through the network diagram and has the least amount of slack or float. Based on the provided network diagram, the critical path is A-C-G-K-M, which has the longest total duration when adding up the individual task durations. Reference = The concept of the critical path is covered in the CompTIA Project+ Certification Study Guide1. For more detailed information on how to calculate and identify the critical path in project management, you can refer to the study guide and other project management resources2.