A qualitative study of academic engagement of five high school students lab
elled mentally retarded describes strategies of student participation and n
on-participation, and teacher perceptions. These students were non-verbal o
r inarticulate, and functioned in an environment of competing formal and in
formal assessments of their participation and understanding in the academic
environment. Teachers' informal assessments of student participation revea
led how the students challenged the conventional categories employed by tea
chers. The examples show the power of educators' perceptions to reveal or o
bscure student engagement.