This paper analyzes the two test forms used by TOEFL: IBT and PBT. The analysiswill focus on the reading comprehension section, its design features, content, andscoring results. The aim is to assess the reliability of the two test forms as well as toidentify factors influencing candidate performance in the reading comprehension test.Three factors are identified: test setting, test difficulty and scoring methods and results.The latter two will be focused on because test difficulty consistency directly decides thetest result consistency. And as the goal of the candidate is to achieve as high a score aspossible, and success is measured in terms of numbers, score reliability is a primaryconcern for both candidate and examining body alike.