Educators know that teaching students to write well is not easy. One problem is the amount of time needed to read through large amounts of work. So some companies have developed computer programs. These can grade students writing more quickly than a person can. Writing tests can also cost less to carry out by computer than paper-and-pencil. These computer systems are known as e-readers. They use artificial intelligence to think in a way like teachers. In the State of Indiana, computer grading of a statewide writing test began with a test of the system itself. For two years, both a computer and humans graded the student writing. Officials say there was almost no difference between the computer grades and those given by the human readers.

　　The entrance test commonly used by business schools, the GMAT, already uses e-readers. The GRE and TOEFL tests might start; officials are deciding. The GRE is the Graduate Record Examination. TOEFL is the Test of English as a Foreign Language.

　　Systems are also being used to grade writing in college classes. The computers read a few hundred examples of student writing already graded by humans. Then the systems compare new writing against those already examined.

　　How do teachers feel all about this? Many say machines can never do the job as well as people can. A computer can find spelling and grammar mistakes. But these teachers say it can never really understand what a writer is trying to say. Critics say a program cannot follow a thought or judge humor or understand a beautifully expressed idea.

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