New PMP Question & Answers with explanation

Nate is the project manager for a research and development project. According to the project communication management plan, Nate has to call in weekly project progress update meetings. The last few meetings were a disaster since more time was spent in arguments and less on decisions. Which of the following techniques does Nate need to quickly acquire?
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Lucy is managing a high-tech software development project. She has luckily acquired the organization’s best performing employees. However, the project team is not communicating effectively, causing delays. The project communications plan is in place, but it seems as if the employees are not following it. The communications plan lays out the communications requirements but does not explicitly assign responsibilities. What should Lucy do first? (Assume that all the following actions need to be taken at some stage.)
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Julia is currently recruiting her project team. She has carried out various interviews and has shortlisted potential candidates. Now, according to the project communication management plan, she has to submit the shortlisted profiles to the project client (customer) for approval. Only then, can she formally hire the approved candidates for the project. The submission of the profiles to the client will go through which of the following processes?
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James is managing a shopping mall construction project. During the project execution, he learns the project communications management plan is not effective and requires a major update. Which of the following processes will issue a change request for the required update?
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Each critical project communication requirement must be carefully analyzed. One good way is to use a communication model to design effective communications. What is the sequence of steps in a basic communication model?
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