Critical Thinking Skills Assessment - California Press
This Web site lists assessment instruments, ordering information, teaching support resources, research reports, consulting services, and faculty development, and workshops available from California Press.

Helping Students Assess Their Thinking
This site explains dimensions of thinking which students needs to master to improve his critical thinking ability. It also provides guidelines he can use while developing his abilities. Don't miss this one!

Holistic Critical Thinking Scoring Rubric
The rubric and instructions for its use are listed at this site.