How you define a gap will depend in part on the capabilities of the sending and receiving systems. For instance, if the maximum size of a field is 20 characters in the sending system but 50 in the receiving, you can safely ignore this gap. However, if the sending system sends 50-character fields to a receiving field with a maximum of 20 characters, you will need to be aware of the gap. You can address this issue by designating a sending application, as follows: