Table 2.

Communication Complexity Scale Levels

Code	Level	Definition	Example
0	No response	Not attending/orienting to objects/examiner	Toy is presented, child looks away.
Pre-intentional Communication
1	Altering Behaviors	After the onset of a communication opportunity, there is a change in behavior	Wind-up toy stops, child smiles.
2	Single Orientation	Orients to object but does not look up or orient body to the examiner	Child picks up toy and stares at it.
3	Single Orientation with one PCBa	Includes a gesture or vocalization	Child picks up toy and vocalizes.
4	Single Orientation with more than one PCB	Includes multiple gestures or vocalizations	Child reaches for toy and vocalizes.
5	Scanning with or without a PCB	Looking from one object to another object	Child looks back and forth between two toys.
6	Dual Orientation	Shift in focus/orientation between object and examiner	Child looks from toy to examiner
Intentional Nonsymbolic
7	Triadic Orientation	3-point shift in gaze from object-examiner-object	Child looks from toy to examiner to toy.
8	Dual Orientation with one or more PCBs	Includes a gesture or vocalization	Child looks from toy to examiner and vocalizes.
9	Triadic Orientation with one PCB	Includes a gesture or vocalization	Child looks from toy to examiner to toy while vocalizing.
10	Triadic Orientation with more than one PCB	Includes multiple gestures or vocalizations	Child looks from toy to examiner to toy while reaching and vocalizing.
Intentional Symbolic
11	One Word Verbalization	Using a word/sign	Child says, “more” to request starting wind-up toy again.
12	Multiple Word Verbalization	Using multiple words	Child says, “more toy” to request starting wind-up toy again.

Note.

^aPCB = Potentially communicative behavior