With the many treatment approaches available, deciding which treatment approach is most appropriate for a particular client may be difficult and will require speech-language pathologist awareness of the treatment options and ability to determine which options best serves that particular client’s severity of the phonological disorder. The multiple oppositions approach is a contrastive approach that simultaneously contrasts several target sounds to a comparison sound. This model typically targets the phoneme collapse and homonymy through the use of larger treatment sets. The use of the larger sets of the multiple oppositions approach includes the child’s rule, or phoneme collapse more systemically when compared to other singular constrastive approaches. Although there is literature that supports its effectiveness in the university clinics, documentation of its effectiveness in a public elementary school setting is limited. Using a single subject multiple baseline design across participants, the present investigation investigated the effectiveness of the multiple oppositions approach in increasing accuracy in production of words for young children with moderate to severe phonological disorders in a public elementary school setting.