Cody is in first grade. He almost never raises his hand to participate in class discussions. When called on, he replies very briefly. He tends to use vague words like stuff and rarely uses full sentences. During decoding exercises, he reads words accurately and easily recognizes common patterns; he is a good speller. When he reads stories aloud, he reads fairly accurately but in an expressionless monotone. Which assessment would be most likely to yield valuable information about Cody?