Evidence supports minimal pairs as an effective intervention for children with phonological disorders. Research by Weiner (1981) and Elbert & Gierut (1986) demonstrated significant improvement using minimal pair contrasts.

Research has shown that three to five word pairs can facilitate generalization in children (Elbert, Powell & Swartzlander, 1991). The authors also reported that some children might require more minimal pairs words.

The SLP should aim for 100 practice trials of the target sounds per session (Sugden et al., 2018).

While minimal pairs therapy at word level only can be enough to facilitate generalization to untreated words in conversation (Elbert et al. 1990), you might decide to include practice at the phrase and/or sentence level if generalization is slow.

Elbert, M., Dinnsen, D. A., Swartzlander, P. & Chin, S. B. (1990). Generalization to conversational speech. Journal of Speech and Hearing Research, 55, 694-699.

Elbert, M., Powell, T. W., & Swartzlander, P. (1991). Toward a technology of generalization: How many exemplars are sufficient? Journal of Speech and Hearing Research, 34, 81-87.

Gierut, J.A.(1989). Maximal opposition approach to phonological treatment. Journal of Speech and Hearing Disorders, 54, 9-19.

Sugden, E., Baker, E., Munro, N., Williams, A.L. and Trivette, C.M. (2018). Service delivery and intervention intensity for phonology‐based speech sound disorders. International Journal of Language & Communication Disorders, 53: 718-734. doi:10.1111/1460-6984.12399

Tyler, A.A., Edwards, M.L., & Saxman, J.H. (1987). Clinical application of two phonologically based treatment procedures. Journal of Speech and Hearing Disorders, 52, 393-409.