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Dear friends,

Construction and development involve various or numerous parties namely the clients, project managers, consultants, contractors etc.

Which one should take precedence - various or numerous ?
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Just choose one. The two of them create a redundancy.
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either, depending on the emphasis you wish to put over.

The number of other parties - use numerous

The variety of other parties - use various.
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Comments  
In this sentence, better use numerous or various ?
 nona the brit's reply was promoted to an answer.
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I would prefer using various because your talking about a variety of things. It would sound better for the sentence.