The following PMP® exam sample question is taken from the Free PMP Exam Simulator at http://free.pm-exam-simulator.com - The answer is at the very bottom:

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You are managing a software development project. You want to create the basis that will be used later on for estimating, scheduling, executing, monitoring, and controlling the project work. Which process performs this activity?

A.) Create WBS
B.) Define Scope
C.) Define Activities
D.) Create Project Management Plan

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Hint: Estimating is performed when the activities are defined and the schedule is prepared.
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ANSWER AND EXPLANATION:
The correct answer is C
Explanation: Activities form a basis for estimating, scheduling, executing, and monitoring and controlling the project work. This is performed in the Define Activities process.
Reference: PMBOK Guide 4th Edition, page 133