For speech-language pathologists

How much practice is enough in speech sound therapy?

Published 21 October 2026 · Updated 21 October 2026

The short answer

The evidence is preliminary but points the same way: more frequent sessions and more production trials tend to help. In an RCT of 54 preschoolers given the same number of sessions, three sessions a week outperformed one a week, and once-weekly treatment didn’t differ from a control. A 2026 scoping review concluded that 2–4 sessions a week are likely more effective than once a week, while noting that few studies test dosage directly.

The terms

Warren, Fey & Yoder (2007) proposed borrowing dosage terms from medicine. As later papers define them:

Dosage terms for communication intervention
Term	Meaning
Dose	The number of teaching episodes (for speech, production trials) per session.
Dose form	The task or activity in which the episodes are delivered.
Dose frequency	How many sessions happen in a period, such as a week.
Total intervention duration	The period over which intervention is given.
Cumulative intervention intensity	The product of dose, dose frequency and total duration.

What the evidence says

Allen (2013) randomized 54 preschoolers to multiple oppositions three times a week for 8 weeks, once a week for 24 weeks, or a storybook control. The three-times-weekly group did significantly better than both, and the once-weekly group didn’t differ from the control, even though both treatment groups received the same total sessions.
A systematic review found only 7 of 580 articles met its criteria; higher intensity was favoured for childhood apraxia of speech and phonological disorders (Kaipa & Peterson, 2016).
A 2026 scoping review of 76 papers, only 4 of which tested dosage directly, concluded that 2–4 sessions a week are likely more effective than once weekly, and that more sessions with more production trials are likely better, possibly up to a threshold. Dosage was often unreported (Titterington et al., 2026).
For childhood apraxia of speech, a 2026 meta-analysis of 25 studies found treatment was effective at two or more sessions a week of at least 45 minutes, with substantial missing data (McCabe et al., 2026).

Allen tested one approach in preschoolers with phonological disorders, so “three times a week beats once” shouldn’t be generalized to every approach or age.

The service gap

ASHA’s 2024 Schools Survey reported a median caseload of 50 for full-time school SLPs, against a median of 40 they considered manageable (ASHA, 2024). That makes research-level session frequency hard to deliver in many settings, which is one reason home practice matters.

Practical implications

Count production trials, not just minutes, and record them.
Where you can’t add sessions, consider whether well-trained home practice can add trials between them. See getting more home practice.
Report dose, frequency and duration in notes and reports, so outcomes can be interpreted.

Questions SLPs ask

Is three sessions a week always better than one?

Not necessarily. The clearest trial (Allen, 2013) tested multiple oppositions in preschoolers. Reviews suggest 2–4 sessions a week are likely more effective than once weekly, but the evidence is preliminary.

What is cumulative intervention intensity?

The product of dose (trials per session), dose frequency (sessions per period) and total intervention duration, from the framework proposed by Warren, Fey & Yoder (2007).

Does home practice count toward dose?

It can add production trials, but evidence on home-delivered dose is limited. Tracking what happens at home at least makes that dose visible.