A burndown chart is a visual representation of the remaining work versus the time required to complete it1. It
is commonly used by agile teams to track the progress of each iteration or sprint and to forecast the project
completion date2. A burndown chart shows the ideal work remaining line and the actual work remaining line,
which can help the team identify any deviations or impediments and adjust accordingly1. A burndown chart is
different from a Pareto chart, which shows the frequency of different causes of problems; a milestone chart,
which shows the key events and deliverables of a project; and a Gantt chart, which shows the dependencies
and durations of tasks in a project3. References = CompTIA Project+ Study Guide: Exam PK0-005, 3rd
Edition, Chapter 6: Planning Projects Part 2, page 173; Burndown Chart: What Is It & How to Use One for
Agile - ProjectManager, Introduction and Components of a Burndown Chart sections; Burndown Chart: What
it is, How to Use it, Example [2023] * Asana, Introduction and What is a burndown chart? sections.

The SOW (statement of work) is a document that defines the scope, deliverables, schedule, and resources of a project. It is a contractual agreement between the buyer and the seller that should be changed first when there are approved changes to the product. Changing the SOW will ensure that the project expectations and requirements are updated and aligned with the customer's requests. The other options are not documents that need to be changed first, but rather metrics or tools that can be used to measure or manage the project. Reference = CompTIA Project+ PK0-005 Certification Study Guide, Chapter 3: Initiating Projects; CompTIA Project+ Certification Exam Objectives, Domain 2: Project Planning, Objective 2.1: Develop a project scope document.

A capital expense is the cost of acquiring or making improvements to fixed assets that have a useful life of
more than one year1. A building purchase is an example of a capital expense, as it is a long-term investment
that increases the value of the company's assets2. Building lease, maintenance, and insurance are not capital
expenses, as they are recurring or short-term costs that do not increase the value of the company's assets3.

The output of this exercise where the project manager is comparing the cost of the project to the cost savings the project will produce when it is complete will produce the return on investment (ROI). ROI is a financial metric that measures the profitability or efficiency of an investment by comparing its benefits or returns to its costs. ROI can help to evaluate the value or worth of a project and support decision making and prioritization. ROI is calculated by dividing the net benefits (benefits minus costs) by the total costs and multiplying by 100 to get a percentage.

A request for proposal (RFP) is the best document for the company to use in this scenario, because it is the most detailed and personalized type of request document. An RFP allows the company to specify the project scope, requirements, deliverables, evaluation criteria, and budget for the structured cabling installation, and to solicit proposals from various vendors that can meet those needs. An RFP also enables the company to compare the vendors based on their qualifications, experience, methodology, and pricing, and to select the best one for the project. An RFP is more suitable than an RFB, RFQ, or RFI, because those documents are less comprehensive and more generic, and they do not provide enough information for the company to make an informed decision. References = CompTIA Project+ Study Guide: Exam PK0-005, Third Edition, Chapter
5: Initiating the Project, page 1131; RFI, RFP, RFQ: Understanding the Differences2; Data Center Structured Cabling RFP Template3