negotiation有讨价还价的含义，我觉得有利害关系的应当使用negotiation，consultation 更多的是 咨询 的意思。

Depends on context: If the parties in 上述各方 have a commonality of interest (e.g., business partners), the import is usually "consultation" ; if they have mostly conflicting interests (as,say, buyer and seller), it's more likely to be a euphemistic take on ''negotiation". If you are not sure, use "talks" or "discussion", as they comprehend both consultation and negotiation.

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Note added at 2 days6 hrs (2008-02-28 15:02:29 GMT)
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充份 should be 充分