The dock lockout dispute that happened between the pma ( pacific marine association ) and the ilwu ( international longshore workers union ) in september and october 2002 in the west coast of the u . s . is just a good case in point to demonstrate the effectiveness of the mechanism in handling labor relations 集体合同制度使得劳动者与用人单位在实际地位上获得一定程度的平等，从而有效地维护劳动者的合法权益。 2002年9 - 10月发生在美国西海岸的“封港”事件已经充分证明了推行集体谈判和集体合同制度的重大现实意义。
