A case study is presented that describes the use of a facilitating phonetic context to decrease the occurrence of an unusual form of gliding. Initially, the child realized the phonemes /l/and /j/as the phone . The process of developing differential phones involved systematic changes that were different from the expected route of development. The intervention technique, based on a facilitating phonetic context, resulted in adult productions of /l/and /j/. This study indicates the potential value of a key word approach in treatment for a recalcitrant phonological disorder.