A project manager is attempting to estimate the costs of an upcoming project using the project’s work breakdown structure.

The parametric method involves using statistical relationships between historical data and other variables to estimate costs. While it can be effective for certain types of projects, it does not specifically rely on the work breakdown structure as the basis for cost estimation, making it less suitable in this context.

The consensus method relies on the collective agreement of experts or team members to estimate project costs. While it can provide valuable insights, it does not utilize the systematic breakdown of project tasks like the apportionment method does and may lead to less precise estimates based on subjective opinions.

The function point method is primarily used for estimating software development costs by measuring the functionality delivered to users. Although it offers a structured approach, it does not apply to the general context of work breakdown structures in project management, as it focuses specifically on software metrics.