From a competitive approach,Principled Negotiation may appear weak.According to the authors of your text,strength or toughness comes in the form of:

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According to the authors of the text, strength or toughness in a competitive negotiation approach comes in the form of firm flexibility, meaning a negotiator is willing to work towards their desired outcome but is also open to alternative solutions that may benefit both parties. This approach shows assertiveness without being overly aggressive or compromising principles. It allows for creativity and collaboration in finding a mutually beneficial agreement.

From a Competitive Approach,Principled Negotiation May Appear Weak