Concept maps are tools for organizing and representing knowledge. They include concepts, usually enclosed in circles or boxes of some type, and relationships between concepts or propositions, indicated by a connecting line between two concepts. Words on the line specify the relationship between the two concepts. Concept maps measured students’ understanding of the complexity of concepts, and interrelationships. Researchers found that concept mapping helped students improve the performance on high cognitive level questions, increase the accuracy and complexity of the students’ knowledge, and have a more positive attitude toward learning science.This study aims to show the impact of using concept maps as a brainstorming to help students organize their own thinking (individual or group) and idea development process to improve their writing skills. It also reviews the traditional techniques used in teaching writing to EFL and identifies concept mapping techniques along with as an application procedure to enhance the writing skill. To achieve the aim of the study of verifying the effectiveness of the concept mapping strategy on the performance of the selected sample which is randomly chosen from the second year students of department of English at college of languages and human sciences / Garmian university,the adopted design which is "Posttest Only Control Group Design" is used.
In this design ,only the experimental group receives the independent variable (concept mapping).After that ,the two groups(control and experimental) are tested and their scores are compared to ascertain the effect of the independent variable .The statistical analysis of the data was carried out by using SPSS. The results indicated that the learners, who have been taught through concept maps produced well-connected paragraph , enough supporting ideas, improved cohesion and coherence, content paragraph structure and enough length in writing. The results manifested that the hierarchical structure of the concept mapping techniques used in the pre-writing process enhanced the EFL learners’writing.