Most educational issues relate to aspects of what makes for good course content, how to evaluate course content, and how to evaluate students' knowledge. For these purposes, lightweight ontology is considered as a tool for knowledge structuring and evaluation. A teacher as an expert evaluates the student's developed ontologies to perform an analysis of the course content and to revise it if necessary. Comparing the ontologies at the beginning and at the end of the course, the teacher evaluates the students' progress.