Section: Volume E

Explanation/Reference:
Explanation:
7.2.2.3 Parametric Estimating
Parametric estimating uses a statistical relationship between relevant historical data and other variables (e.g., square footage in construction) to calculate a cost estimate for project work. This technique can produce higher levels of accuracy depending upon the sophistication and underlying data built into the model. Parametric cost estimates can be applied to a total project or to segments of a project, in conjunction with other estimating methods.
Process: 6.5 Estimate Activity Durations
Definition: The process of estimating the number of work periods needed to complete individual activities with estimated resources.
Key Benefit: The key benefit of this process is that it provides the amount of time each activity will take to complete, which is a major input into the Develop Schedule process.
Inputs
1. Schedule management plan
2. Activity list
3. Activity attributes
4. Activity resource requirements
5. Resource calendars
6. Project scope statement
7. Risk register
8. Resource breakdown structure
9. Enterprise environmental factors
10.Organizational process assets
Tools & Techniques
1. Expert judgment
2. Analogous estimating
3. Parametric estimating
4. Three-point estimating
5. Group decision-making techniques
6. Reserve analysis
Outputs
1. Activity duration estimates
2. Project documents updates

Section: Volume E
Explanation/Reference:
Explanation:
PROJECT MANAGEMENT PROCESSES
Project management is the application of knowledge, skills, tools, and techniques to project activities to meet the project requirements. This application of knowledge requires the effective management of the project management processes.
A process is a set of interrelated actions and activities performed to create a pre-specified product, service, or result. Each process is characterized by its inputs, the tools and techniques that can be applied, and the resulting outputs. As explained in Section 2, the project manager needs to consider organizational process assets and enterprise environmental factors. These should be taken into account for every process, even if they are not explicitly listed as inputs in the process specification. Organizational process assets provide guidelines and criteria for tailoring the organization's processes to the specific needs of the project. Enterprise environmental factors may constrain the project management options.