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6 - PROJECT TIME MANAGEMENT

6.5.1.9 Enterprise Environmental Factors

Described in Section 2.1.5. The enterprise environmental factors that can influence the Estimate Activity
Durations process include, but are not limited to:

• Duration estimating databases and other reference data,
• Productivity metrics,

• Published commercial information, and
• Location of team members.
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6.5.1.10 organizational Process Assets

Described in Section 2.1.4. The organizational process assets that can influence the Estimate Activity Durations
process include, but are not limited to:

• Historical duration information,
• Project calendars,
• Scheduling methodology, and

• Lessons learned.

6.5.2 Estimate Activity durations: tools and techniques

6.5.2.1 Expert Judgment

Expert judgment, guided by historical information, can provide duration estimate information or recommended
maximum activity durations from prior similar projects. Expert judgment can also be used to determine whether to
combine methods of estimating and how to reconcile differences between them.

6.5.2.2 Analogous Estimating

Analogous estimating is a technique for estimating the duration or cost of an activity or a project using
historical data from a similar activity or project. Analogous estimating uses parameters from a previous,
similar project, such as duration, budget, size, weight, and complexity, as the basis for estimating the same
parameter or measure for a future project. When estimating durations, this technique relies on the actual
duration of previous, similar projects as the basis for estimating the duration of the current project. It is a
gross value estimating approach, sometimes adjusted for known differences in project complexity. Analogous
duration estimating is frequently used to estimate project duration when there is a limited amount of detailed
information about the project.

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©2013 Project Management Institute. A Guide to the Project Management Body of Knowledge (PMBOK Guide) – Fifth Edition 169

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