Dose:
- Eliciting approximately 100 targets in single words per session (Baker and McLeod 2004, Weiner 1981, Williams 2005)
Session length:
Sessions typically last:
- 30 minutes (Weiner 1981, Dodd et al. 2008, Williams 2000)
- 30-40 minutes (Rvachew and Nowak 2001)
- 45 minutes (Baker and McLeod 2004)
- 45-60 minutes (Ray 2002)
- 60 minutes (Tyler et al. 1987)
Dose frequency:
- 2 sessions per week (Baker and McLeod 2004, Tyler et al. 1987, Williams 2000)
- 3 sessions per week (Ray 2002, Weiner 1981)
Total intervention duration:
- Overview: 4.5 – 45 hours (mean ~18 hours) – typically over a range of 2-27 weeks (mean: 9.5 weeks) (Williams et al 2010)
- Number of sessions ranges from 6-8 (Weiner 1981) and 32-67 (Saben and Ingham 1991)
NOTE: The two children included in Saben and Ingham's (1991) study may have had articulation difficulties rather than phonological, so may not be representative.
Cumulative intervention intensity:
- Tyler et al. (1987) reported 720 - 1600
- Weiner (1981) reported 1800 - 2400
- Baker and McLeod (2004) reported 2400 / 6200
NOTE: This research has not taken place from referral to discharge. Often, the time allowance for research intervention is pre-determined.