Go to your university's library website, and use its catalog-search page to explore a topic that interests you. Evaluate the set of pages resulting from the search, using the extract from the heuristic evaluation instrument included in this chapter. Include comments and severity rankings. Compare your ratings and comments with three or four of your classmates. On what do you agree and disagree? What criteria were you each using to determine "level of severity"? With these three or four classmates, try to agree on criteria for defining severity level.