According to Table 2, the result from dependent t-test at 0.05 significance level revealed that the average scores of the students’ self evaluation in each stage of
testing were significantly different. Apparently, after having experienced the learning process with simulation strategy, the students evaluated themselves increasingly at
later stages. As the result from Table 3 and Figure 1, after having compared the result of the students’ self evaluation on their communicative oral English proficiency in each
behavioral aspect, it was found that at the first stage, they evaluated themselves medium in every aspect. At the second stage, they evaluated themselves good except in
fluent and continuous conversation aspect as medium. Finally at the last stage, they evaluated themselves at good level in every aspect. Therefore, it can be concluded that
using simulation in teaching communicative oral English proficiency is enable students to use English more confidently.