The major and foremost aim of the research had been to observe an effect of (CLT) communicative language teaching approach on functional writing skills among 9th graders in Pakistani high schools. Relevant literature revealed that functional writing skills can be increased through (CLT) communicative language teaching approach. Quasi Experimental design, that is, pretest posttest nonequivalent control group design was used. Threats to internal/external validity were undertaken properly. The pre-test was the same, and it had been used as the post-test as well. Creative compositions related to functional writing skills were examined carefully and were marked as per scoring rubrics. The (CLT) communicative language teaching approach is recommended for English teaching specifically writingrelated tasks in the subject of English.