New PMP Question & Answers with explanation

A project manager estimates the work to be accomplished in the near term in detail at a low level of the Work Breakdown Structure (WBS). He estimates work far in the future as WBS components that are at a relatively high level of the WBS. What is this technique called?
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Most project management software packages use a method of constructing a project schedule network diagram known as:
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A hierarchical structure of project resources organized by category and resource type, used in planning, managing and controlling project work, is:
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During a presentation to management, you want to display the project schedule with only the key deliverables displayed. What is the correct tool for this purpose?
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Which of these is not an established Estimate Activity Durations technique?
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