In a nutshell, I was taught to address the error sounds a child is stimulable for first. That seems to make sense. In theory they would make progress faster and with less frustration than with sounds that are harder for them.
The article I read claimed that more recent research (I have not had time to look up the source articles yet, so take this with a grain of salt until I can confirm.) shows that often, children will acquire the sounds they are stimulable for on their own given time. Therefore, time in therapy should be spent on the sounds they are least stimulable for. If you spend 3 months establishing and working on /k/ and in the meantime, the /t/ which they were stimulable for pops in on its own, the child now has some mastery of two sounds at the end of that time period instead of just one.
This therapist chooses two targets to work on with a child at any given time. She chooses the two most complex sounds the child is not stimulable for that have the most contrast (voicing, manner, place). This is an entirely different model of choosing targets than I was taught to use, but the idea is intriguing.
I have two questions for any readers that might want to discuss this:
- Have you encountered this approach to articulation/phonology therapy before, and what do you think?
- If you agree that this approach has merit, do you think that this approach also applies to children with motor planning problems (apraxia)?