The two best general paths to improve your negotiation effectiveness are:

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to follow the model of someone who has negotiated for many years.

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to find a book that lists the rules of negotiation.

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to learn how to know yourself and others, learn how to assess and understand conflict, learn how to communicate effectively in all contexts, learn principles of persuasion, and learn how to prepare for specific negotiations.

$$ to increase your critical thinking ability and your emotional intelligence.