---------------------- Forwarded by Tom Halliburton/Corp/Enron on 05/25/2000 
09:05 AM ---------------------------


Chonawee Supatgiat
05/22/2000 11:56 AM
To: Grant Masson/HOU/ECT@ECT, Pinnamaneni Krishnarao/HOU/ECT@ECT, Tom 
Halliburton/Corp/Enron@Enron
cc:  

Subject: CPLEX


---------------------- Forwarded by Chonawee Supatgiat/Corp/Enron on 
05/22/2000 11:55 AM ---------------------------
From: Samer Takriti@ENRON COMMUNICATIONS on 05/22/2000 11:46 AM
To: Stinson Gibner/HOU/ECT@ECT
cc: Chonawee Supatgiat/Corp/Enron@Enron, Ravi Thuraisingham/Enron 
Communications@Enron Communications 

Subject: CPLEX

Stinson,
Krishna mentioned that Tom wants to buy (may have bought) Xpress. Tom's 
argument is that Xpress's language allows the user to express special ordered 
sets (certain types of constraints) in a convenient fashion. Chonawee and I 
just talked to two of Cplex's consultants (whom I know personally). They both 
mentioned that these sets are recognized and handled implicitly within Cplex. 
As a result, there is no need for their modeling language to express these 
constraints explicitly.
As a result, I feel that we should go with Cplex. Both Chonawee and Krishna 
seem to have the same impression. I need to get a final vote on this one so 
that we can order the licenses. This has been dragging on for too long.
-Samer
[Chonawee, my address book does not recognize ENA users. Please forward to 
Grant, Krishna, and Tom]