What is the lowest level of detail at which the cost and schedule for the work can be estimated?

What is the lowest level of detail at which the cost and schedule for the work can be estimated?

• A. System Element
• B. Schedule Baseline
• C. Work Package
• D. Task List

Answer: (C)

The key idea is how projects are broken down for planning and control. The work package is the smallest unit in a Work Breakdown Structure that is defined enough to be owned, funded, scheduled, and tracked. It has a defined scope, owners, resources, and an estimated cost and duration. Because of this, cost and schedule estimates are most credibly prepared at the work package level—they’re detailed enough to be meaningful, yet still aggregate up to the higher levels for the project budget and overall timeline. You can drill into activities inside a work package for more granular scheduling, but the formal baselines used to measure performance are built from the work package estimates. The other options don’t fit this purpose: a schedule baseline is the approved plan, not the estimation unit; a task list is a collection of activities, not the lowest level designated for credible cost and schedule estimates in the standard structure; and a system element isn’t a standard PM term for this context.

The key idea is how projects are broken down for planning and control. The work package is the smallest unit in a Work Breakdown Structure that is defined enough to be owned, funded, scheduled, and tracked. It has a defined scope, owners, resources, and an estimated cost and duration. Because of this, cost and schedule estimates are most credibly prepared at the work package level—they’re detailed enough to be meaningful, yet still aggregate up to the higher levels for the project budget and overall timeline. You can drill into activities inside a work package for more granular scheduling, but the formal baselines used to measure performance are built from the work package estimates. The other options don’t fit this purpose: a schedule baseline is the approved plan, not the estimation unit; a task list is a collection of activities, not the lowest level designated for credible cost and schedule estimates in the standard structure; and a system element isn’t a standard PM term for this context.