隨著企業所面臨的競爭加劇，企業開始透過與夥伴的共同合作來提升競爭力。然而，學者及業界都發現：雖確有部分企業由關係中獲得了益處，但仍有部分企業是失敗的，甚至因而蒙受巨大損失，由此，開始有學者懷疑在關係中，可能潛藏著會導致會使關係失敗之因素，此即關係黑暗面之概念。

本研究沿用目前可知較具理論架構之關係張力觀點為基礎，使用質性研究之個案研究法(case study)，並選定廣告主及媒體代理商之夥伴關係為研究對象，嘗試探討關係張力不平衡會如何導致關係黑暗面的產生，以及除了關係張力不平衡外，關係黑暗面還會在什麼情況下產生並嘗試了解當察覺到關係黑暗面時，該如何因應。

本研究發現張力不平衡可能由以下行為導致關係黑暗面的產生：(1)提出過當要求，而另一方也接受(2)猜疑對方有投機行為，致使決策變得不客觀(3)對於夥伴有過高期待及依賴，一有不順心的地方就會被放大(4)一方無法拒絕亦無法滿足另一方需求(5)領導人個性及組織文化的不同，使雙方難以理解彼此的行為；除張力不平衡外，當其中一方的訊息傳遞不順暢、領導者檢視錯誤的能力不足、專業能力或知識不足，或總是滿足對方不當的需求等管理問題，亦可能導致黑暗面產生；其因應之主要方法為透過委婉表達意見、頻率性的接觸、在夥伴提出需求前就先早一步行動及不斷讓對方感受到自己創新的動能等方式，來減少負面影響。

Recently, the corporation has faced more competition and start to co-create the value with partners to enhance the competitiveness. Nevertheless, academia and practicians has found that although some of enterprise acquired value in the relationship, but others has failed even paid vast amount of loss. Hence, some of academia doubt there’s a factor hiding in the relationship which will lead the relationship disrupted. Scilicet, this is the construct of the dark side of relationship.
To probe into above-mentioned two reason, this paper using case study method and Relationship Tensions Based View which compared with the other theory is more structural to research, and choose the relationship of Client-Agency to be research object to find out How does unbalanced tension led the dark side occurred, What factor will bring the dark side except unbalanced tension, and How to solve it.
The finding suggests that unbalanced tension could lead the dark side by the behavior which mentioned below. First, offer the improper request, and the other one accepted. Second, doubt the opposite side comes out the opportunistic behavior, and let the decision lose the objective. Third, when one side over expected and rely on the other side, they will become easily to complain for simply thing. Fourth, one side can neither refuse the other side’s require nor satisfy them. The last one, due to the different personality of the leader and the organization culture, both sides can hardly understand each other’s behavior.
Except unbalanced tension, the dark side relationship could lead by the management problem. First of all, the message cannot be distribute between two parties smoothly. Next, one side is lack of the ability to exam the mistake. Third,
one side is short of expertise or knowledge. Finally, one side always satisfied the other side’s improper request.
The primary strategy to decline the negative influence of the dark side of relationship are to express the opinion tactfully, contact the other side frequently, prepare before the other side asking, and let them feel the energy of innovation continuously.

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