Independent Samples t-test was used to calculate the data. After 10 sessions of instruction, 50 minutes each, they took the post-test. The control group received conventional instruction on learning vocabularies including definitions, explanation and translation. Eight passages of their reading lessons were covered in ten sessions. The experimental group received vocabularies encompassing the passages taught through the Mind Mapping software 6 (v3.5.3.0) from website as treatment to participants of experimental group.

Then they were divided into two groups and sat for the vocabulary pre-test designed on the instructed material.

The learners whose scores were one standard deviation above and one standard deviation below the mean were selected as the participants of the study. Its reliability value was met through calculating KR-21 formula. They were chosen based on Interchange Language Placement test (Richards & Lesley, 2007) administered as a homogeneity test. Sixty EFL learners were selected out of 90 learners. The study was conducted in a pre-university center in Masjedsoleyman. This study investigated the role of mind mapping software in using vocabulary among EFL pre-intermediate students.

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