Simulated cross-examination will generally reveal potential weaknesses in an expert witness. Watch for inconsistencies. Experts should be supplied with everything that might bear on their opinions. Don't wait until the last minute to do the preparation. Have your experts think about possible questions and responses and warn them about possible opposing tactics.
Some experts have a tendency to exaggerate the strengths of a case.
Assure them that it is often more valuable that they point out any weaknesses and voice more conservative opinions. It is also wise that the experts' message be delivered in more simple language than they or you would ever believe necessary. In deposing an expert witness, restraint and self-education are the keys. As an attorney, you must make a judgment call whether to concentrate on getting facts and opinions and holding back tough questions until time of trial, or cross-examining for fatal concessions. There are advantages and disadvantages to both methods.