The electronic health record system at a healthcare facility refers to a heart attack as a “myocardial infarction.” Another system used by the same healthcare facility refers to this condition simply as a “heart attack.” When the systems share patient information, the patient’s record shows that the patient has been diagnosed with (1) a heart attack and (2) a myocardial infarction. The systems don’t see the conditions as one and the same. This is an example of ___ among the systems.