Difficult because... It cannot be seen in the mouth. There are variations in placement for correct production. Often times, individuals receive therapy for producing it correctly but are not trained to recognize it in words or to discriminate correct and incorrect productions--then they have difficulty carrying it over into conversation for life experiences. But unfortunately when this happens, they are sometimes dismissed from services--just because they can "say it the right way in therapy." Do you know someone who has difficulty correctly producing that tricky r sound? Help is available!