Originally posted by: SharabhShukla

Hi,

I have an MIP problem that requires bound tightening, I am thinking about user supplied cuts/Lazy Constraints to tighten the model bounds, so as to improve on the performance.

I have two questions

(1) Is my understanding of the problem and the solution correct ? Please see the log file attached for more details

(2) Is it possible to write LazyConstraintCallBacks in OPL. Can somebody point me to some of the links or literature/examples/manuals?

The answer to your question (2) is at http://www-01.ibm.com/support/docview.wss?uid=swg21681643: yes, you can add lazy constraints using external Java calls.