Individualized Educational Plan (IEP) is one of the most essential factors to the success of individualized instruction of students receiving special education. However, the writing of IEP imposes extra workload to special education teachers. As a result, they tend to spend more time in paper work and less time in actual teaching activities. To relieve the problem mentioned above, we have developed a computerized IEP system and conducted study to investigate the impact of such system on the quality of special education instruction. The computerized IEP system, together with a questionnaire, are sent to 1369 resource-rooms within Taiwan. 594 resource-room teachers responded and some of the major findings are summarized below: (1) Only 4$ of the respondents are currently using computerized IEP software to assist their IEP writing. (2) Most of the respondents (59%) spend more than 3 hours in writing one IEP (32.7%of them spend between 1~3 hours). With the help of computerized IEP software, 57.9% of them can finish an IEP in less than 1 hour. A more insight analysis reveals that in average, a teacher can save up to 196.5 minutes in writing one IEP if assisted by our software. (3) 80.3% of the respondents agree that computerized IEP software facilitates the management of students data. (4) 71.2% of the respondents agree that computerize IEP software can play a major role in supporting resource-room instruction. (5) In average, by using computerized IEP software, resource-room teachers can save up to 196.5 minutes per IEP writing.