Construct validity
Construct validity pertains to the meaningfulness and appropiateness of the test score interpretations. Both construct definition and the characteristics of the test tasks should be considered when we are evaluating construct validity of a score interpretation . In writing section, test takers' abilities of choosing vocabulary correctly, building grammatical structure, spelling words and using punctuation accurately, and expressing information in an organized manner are tested. Those abilities are believed to be main factors of achieving successfully writing in college and university settings. The scoring procedures of TOEFL iBT writing also reflect the construct definition. ETS claims that test takers are not expected to produce a perfect essay. They can earn high score with a response that contains some errors.