Strategy use and its impact on standardized reading test performance w
ere investigated. High school students were randomly assigned to 2 gro
ups, standardized test and main idea, with separate control and think-
aloud conditions. In the standardized think-aloud group, students thou
ght aloud while taking a portion of a reading test, consisting of pass
ages accompanied by several questions each. In the main idea condition
s, students read the same passages with the lower level questions remo
ved and answered a single multiple-choice question about the main idea
of each passage, having been told that the task was not a test. Both
groups used strategies, and students in the standardized test conditio
n made significantly greater use of strategies than students in the ma
in idea condition. Significant between-group differences were found in
use of rereading. In comparisons between the think-aloud and control
conditions, thinking aloud was found to have a significant detrimental
effect on students' ability to identify passage main ideas.