Martha Simms is the plaintiff in a contract suit she has brought against Floral Supply, Inc., for its failure to deliver the green sponge Martha needed in building the floral designs she sells to exclusive home decorators. Martha had to obtain the sponge from another supplier and was late on seven deliveries. One of Martha’s customers has been called by Martha’s lawyer as a witness and is now on the witness stand, testifying about Martha’s late performance and the penalty she charged. The lawyer for Floral Supply knows that Martha’s customer frequently waives penalties for good suppliers. How can Floral Supply’s lawyer get that information before the jury?