The main materials applied for the experimental group were cards containing roles to be
practiced in the class on the basis of TBLT considerations. The participants in the
control group did not experience working with TBLT- based role play cards. As
mentioned so far, to measure the subjects' speaking ability, the study has utilized IELTS
speaking in its pretest and posttest. As stated earlier, role-play cards were provided and
assigned to the subjects in the experimental group. They were developed according to
TBLT conditions and those in the experimental group were asked to play the roles
described on each card. The subjects in the control group followed the materials
provided for them based on traditional methods of language teaching without
encountering TBLT-adopted role-play cards. Following the implementation of IELTS
speaking in pre test stage, the recorded samples of the subjects' performance were
assessed by four raters and two raters with the closest means of scores were selected
for both pre and post test assessment. As Table 1 reveals, the experimental and control
groups had rather similar means, standard deviations and variances which prove the
fairness of the selection and sampling process. As Table 2 reveals the result of t-test for
both groups in the pretest. It seems that experimental group outperformed the control
group. To see if the difference between the means of the experimental group and the
control group was meaningful, another independent t.