They indicated that more structured the tasks generated more fluent the language, and complexity of language was influenced by processing load. A study by Jeng et al (2000) used experimental design methods to compare three tasks of oral assessment. Results show that individual interviews took more time and effort, but were perceived to have higher value largely due to its interactive features between examinees and examiners. There were more problems with four paired discourse and taped recording methods. moreover, Wu, R. (2002) examined the influences on task difficulty of performance circumstances associated with the code complexity of written input in the read-aloud tasks of a semi-direct speaking test.