The following results of an articulation test are from Ryan, age 6;6. We noted his phonological processes in Chapter 4.

Based on Ryan’s age, compare which sounds might be considered in error if the ages of speech sound development from the Poole (1934) versus the Templin (1957) investigations are used (page 125). (Actually any two studies could be used for comparison.) Discuss the problems when using these sound mastery age levels.