This action research study investigates the role of Data-Based Decision-Making (DBDM) in increasing academic outcomes within a charter school network. During Cycle 1, interviews and focus groups with teachers, interventionists, and school deans shed light on critical themes, including leadership, data collection, analytic capacity, and a culture of data use. Cycle 2 delved deeper into the practical application of DBDM, revealing its impact on academic success. The study resulted in five key findings related to DBDM in the educational context. First, DBDM enables personalized instruction and targeted interventions, leading to increased student engagement and academic performance. Second, the essentiality of high-quality data for effective DBDM was highlighted, thus necessitating strong data systems and integration strategies. Third, continuous staff training and development were underscored to empower teachers to use DBDM effectively. Fourth, time management and flexible scheduling emerged as crucial to mitigate the challenges associated with DBDM implementation. Finally, integrating Professional Learning Communities (PLCs) with DBDM was proposed, forming a focused, data-driven, cyclical, and collaborative framework for instructional improvement. The study emphasizes DBDM's potential to enhance student achievement and provides key recommendations for its implementation, including stringent data quality measures, ongoing staff training, stable staffing, efficient time management, and a sustained improvement plan for DBDM. Implementing these recommendations could optimize DBDM's benefits, enhance teaching efficacy, and improve student outcomes. Lastly, the study encourages the extension of DBDM practices to other grade levels and disciplines, promoting a more effective educational environment. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]