VIDBE-Q Volume 65 Issue 2
39
Figure 2. Terry's communication development over time (Probst, 2017).
Ian's data illustrated communication development at a slightly higher rate of
increase than Terry (see Figure 3). However, this rate of development, when
compared to a typically developing child, is quite delayed. Significantly, Ian's flat
growth trajectory from IEP numbers 14 to 21 (ages 11-21.75) indicates no
communication development noted in over 8 years (n = 8 IEPs).
As evidenced in the charts, both learners' development of communication
skills was minimal and remarkably delayed when compared to typically
developing children. Notably, Terry's data displayed a variability across the
categories (ages 12-14) and then stayed stable (ages 15-18) while Ian's figures
illustrated a flat trajectory (ages 11-21). This could imply that, while both Terry
and Ian were developing some communication skills at younger ages, this
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