The Preschool SLP

24. Is the Complexity Approach Really Effective? Debunking 20 Years of Misleading Research


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Is there real evidence against the complexity approach in treating speech sound disorders—or is it all smoke and mirrors?

In this episode, I critically review one of the most highly cited (but deeply flawed) studies used to argue against the complexity approach. We’ll break down:

  • Why the study’s design set children up for “mission impossible” goals
  • How it misrepresented the complexity approach by using singletons instead of clusters
  • Why comparing earlier vs. later developing sounds is like comparing a 5K to a marathon
  • What the research actually shows: complex clusters create cascading gains across the speech system

By the end, you’ll be equipped to confidently respond when someone cites this outdated study as “evidence” against the complexity approach.

Therapy minutes are too valuable to waste on outdated methods. The SIS Membership gives you ready-to-go, literacy-based, movement-rich activities that align with what the research actually supports.

Every week you’ll get:

  • Theme-based activities that target complexity and literacy skills
  • A Google Slides deck for parents, large groups, and teletherapy
  • Tools that help you create cascading change in speech and language outcomes

👉 Stop letting myths about the complexity approach hold your therapy back. Join SIS today at https://www.kellyvess.com/sis.

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The Preschool SLPBy Kelly Vess, MA, CCC-SLP