The study aimed at assessing the impact of writing across the curriculum on standardized test scores by completion of fifth grade: An in-depth review of extensive writing practices within elementary classroom. The main purpose of the study was to examine the impact of writing as a teaching technique. The study used 150 learners in public elementary schools in Southwest Mississippi. The researcher also used the school administrators as the research respondents. The study assumed that the teachers have vast knowledge about writing as a teaching technique. However, the study was limited by the inaccuracy of the information from some of the respondents. The study used quantitative design to analyze data. The primary tool for data collection was mostly current, post-test scores, questionnaires and interview schedules. The research adhered to ethical considerations and conducted an informed consent. Although, a letter for permission to conduct formal observations and research using test data was delivered to the Superintendent, it was not utilized impart to the fact that the data used to conduct research was public information. Verbal consent was given by the Superintendent to conduct research utilizing only informal observations and public test data.Many public institutions in the State of Mississippi adhere to an open-door policy which permits multiple observations.All data and observations utilized in this research was conducive to all laws, rules, and regulations set forth by the Mississippi Department of Education.