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Which sentence is correct? 

  • my project is dependent upon your project completing
  • my project is dependent on your project completing.
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See also: english.stackexchange.com/questions/8563/…. –  Steve Melnikoff May 17 '11 at 11:51
    
Well it all depends..................... –  Quick B. Fox May 15 at 20:28

2 Answers 2

They are equivalent; upon is just a more formal term for on, and it is especially used in abstract senses.

The NOAD reports the following note about the usage of upon:

The preposition upon has the same core meaning as the preposition on. Upon is sometimes more formal than on, however, and is preferred in the phrases once upon a time and upon my word, and in uses such as row upon row of seats and Christmas is almost upon us.

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