This is to confirm receipt by facsimile of the executed NDA between Enron
and PetroVantage. We will have it executed by PetroVantage and return it as
soon as possible. In the meantime, if you have any questions or concerns,
please feel free to contact Bouran Qaddumi of the AspenTech legal department
at 617-949-1225. Thank you.



-----Original Message-----
From: Tana.Jones@enron.com [mailto:Tana.Jones@enron.com]
Sent: Wednesday, April 18, 2001 11:28 AM
To: Wayne C. Bartel
Cc: Bob.Shults@enron.com; Mark.Greenberg@enron.com
Subject: NDA - Aspen Technologies


At the request of Bob Shults, I am attaching our proposed form of
Non-Disclosure Agreement.   I am not sure if we have the correct legal name
of your company, so can you please verify that for me.  If you have any
comments or questions please call Mark Greenberg, Senior Counsel, at (713)
345-8897 or me at (713) 853-3399.  We look forward to hearing from you.

(See attached file: aspen technologies.doc)


 - aspen technologies.doc